• 走るはしる
  • ·to run
  • ·to run (of a vehicle); to drive; to travel; to move; to sail
  • ·to rush (to); to dash; to race
  • ·to retreat; to flee; to defect (to)
  • ·to run away; to abscond; to elope
  • ·to flash (of lightning); to streak; to shoot (through; e.g. of pain); to run (through); to flare; to flit (e.g. across one's face); to spread quickly (of news, shock, etc.)
  • ·to go (e.g. bad, to extremes); to become; to turn; to take to (e.g. crime); to get carried away by (e.g. one's emotions); to get involved in; to get wrapped up in
  • ·to run (through; of a road, street, etc.); to extend (e.g. of a mountain range); to stretch; to lie
  N5
• できる
  • ·to be able to do; to be possible; to be permitted (to do)
  • ·to be good at; to do well; to be proficient (in); to be capable
  • ·to come into existence; to form; to appear; to come up (of a matter); to be born; to make (a friend); to get (a girlfriend, free time, etc.)
  • ·to be made; to be built; to be constructed; to be formed; to be established; to be set up
  • ·to be finished; to be completed; to be done; to be ready
  • ·to grow (of a crop); to be produced
  • ·to be mature and well-balanced; to be of fine character
  • ·to be by nature; to be born ...
  • ·to become (sexually) involved (with); to become intimate (with); to take up (with someone)
  • ·to get pregnant
  N5
• ある
  • ·to be; to exist; to live
  • ·to have
  • ·to be located
  • ·to be equipped with
  • ·to happen; to come about
  • ·to exist (in a completed state); to be (something unchanged in its current state)
  N5
• 速いはやいAs it appears here: 速く
  • ·fast; quick; rapid; swift; speedy; brisk; prompt
  • ·early; soon; earlier than usual
  • ·premature; too soon; too early
  • ·easy; simple; quick; fast
  • ·as soon as ...; the moment ...; the instant ...
  N5
• なる
  • ·to become; to get; to grow; to turn; to reach; to attain
  • ·to result in; to turn out; to end up; to prove (to be)
  • ·to consist of; to be composed of; to be made up of
  • ·to be completed; to be realized; to succeed; to be attained; to be accomplished
  • ·to change (into); to turn (into); to transform
  • ·to come (to do); to begin (to do); to grow (to do)
  • ·to come to; to amount to; to add up to; to make
  • ·to play (the part of); to act as
  • ·to be used for; to be useful for; to serve as
  • ·to be promoted
  • ·to do ...
  N5
• 難しいむずかしい
  • ·difficult; hard; troublesome; complicated; serious (disease, problem, etc.)
  • ·impossible; unfeasible
  • ·fussy; particular; fastidious; hard to please; displeased
  • ·gloomy; glum; sullen; serious (look)
  • ·dirty; unclean; filthy; detestable
  • ·unpleasant; uncomfortable; creepy; spooky
  N5
• 教えるおしえるAs it appears here: 教えられた
  • ·to teach; to instruct
  • ·to tell; to inform; to show
  • ·to preach
  N5
• する
  • ·to do; to carry out; to perform
  • ·to cause to become; to make (into); to turn (into)
  • ·to serve as; to act as; to work as
  • ·to wear (clothes, a facial expression, etc.)
  • ·to judge as being; to view as being; to think of as; to treat as; to use as
  • ·to decide on; to choose
  • ·to be sensed (of a smell, noise, etc.)
  • ·to be (in a state, condition, etc.)
  • ·to be worth; to cost
  • ·to pass (of time); to elapse
  • ·to place, or raise, person A to a post or status B
  • ·to transform A to B; to make A into B; to exchange A for B
  • ·to make use of A for B; to view A as B; to handle A as if it were B
  • ·to feel A about B
  • ·verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs")
  • ·creates a humble verb (after a noun prefixed with "o" or "go")
  • ·to be just about to; to be just starting to; to try to; to attempt to
  N5
• なぜ
  • ·why; how; for what reason
  N5
• その
  • ·that; the
  • ·part (as in "part two")
  • ·um ...; er ...; uh ...
  N5
• いくAs it appears here: いかない
  • ·to go; to move (towards); to head (towards); to leave (for)
  • ·to move through; to travel across; to walk along (e.g. a road)
  • ·to go (well, badly, etc.); to proceed; to turn out; to get along
  • ·to do (in a particular way); to go (with; a choice); to try
  • ·to pass (of time, seasons, etc.); to go by
  • ·to stream; to flow
  • ·to die; to pass away
  • ·to reach (a stage, extent, age, etc.); to get to; to go (so far as ...)
  • ·to reach (of information, instructions, wind, etc.); to arrive
  • ·to continue ...; to go on ...; to (progress) steadily; to gradually ...; to progressively ...
  • ·to have an orgasm; to come; to cum
  • ·to trip; to get high; to have a drug-induced hallucination
  N5
• 方かた
  • ·direction; way
  • ·person; lady; gentleman
  • ·method of; manner of; way of
  • ·care of ...
  • ·person in charge of ...
  • ·side (e.g. "on my mother's side")
  N5
• するAs it appears here: しよう
  • ·to do; to carry out; to perform
  • ·to cause to become; to make (into); to turn (into)
  • ·to serve as; to act as; to work as
  • ·to wear (clothes, a facial expression, etc.)
  • ·to judge as being; to view as being; to think of as; to treat as; to use as
  • ·to decide on; to choose
  • ·to be sensed (of a smell, noise, etc.)
  • ·to be (in a state, condition, etc.)
  • ·to be worth; to cost
  • ·to pass (of time); to elapse
  • ·to place, or raise, person A to a post or status B
  • ·to transform A to B; to make A into B; to exchange A for B
  • ·to make use of A for B; to view A as B; to handle A as if it were B
  • ·to feel A about B
  • ·verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs")
  • ·creates a humble verb (after a noun prefixed with "o" or "go")
  • ·to be just about to; to be just starting to; to try to; to attempt to
  N5
• するAs it appears here: し
  • ·to do; to carry out; to perform
  • ·to cause to become; to make (into); to turn (into)
  • ·to serve as; to act as; to work as
  • ·to wear (clothes, a facial expression, etc.)
  • ·to judge as being; to view as being; to think of as; to treat as; to use as
  • ·to decide on; to choose
  • ·to be sensed (of a smell, noise, etc.)
  • ·to be (in a state, condition, etc.)
  • ·to be worth; to cost
  • ·to pass (of time); to elapse
  • ·to place, or raise, person A to a post or status B
  • ·to transform A to B; to make A into B; to exchange A for B
  • ·to make use of A for B; to view A as B; to handle A as if it were B
  • ·to feel A about B
  • ·verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs")
  • ·creates a humble verb (after a noun prefixed with "o" or "go")
  • ·to be just about to; to be just starting to; to try to; to attempt to
  N5
• するAs it appears here: された
  • ·to do; to carry out; to perform
  • ·to cause to become; to make (into); to turn (into)
  • ·to serve as; to act as; to work as
  • ·to wear (clothes, a facial expression, etc.)
  • ·to judge as being; to view as being; to think of as; to treat as; to use as
  • ·to decide on; to choose
  • ·to be sensed (of a smell, noise, etc.)
  • ·to be (in a state, condition, etc.)
  • ·to be worth; to cost
  • ·to pass (of time); to elapse
  • ·to place, or raise, person A to a post or status B
  • ·to transform A to B; to make A into B; to exchange A for B
  • ·to make use of A for B; to view A as B; to handle A as if it were B
  • ·to feel A about B
  • ·verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs")
  • ·creates a humble verb (after a noun prefixed with "o" or "go")
  • ·to be just about to; to be just starting to; to try to; to attempt to
  N5
• 体からだ
  • ·body
  • ·torso; trunk
  • ·build; physique; frame; figure
  • ·health; constitution
  N5
• しかし
  • ·however; but
  N5
• 時間じかん
  • ·time
  • ·hour
  • ·period; class; lesson
  N5
• また
  • ·again; once more; once again; another time; some other time
  • ·also; too; as well; likewise
  • ·on the other hand; while
  • ·and; in addition; besides; moreover; furthermore
  • ·or; otherwise
  • ·really; how; (what, why) on earth
  • ·some time (in the future)
  • ·indirect
  N5
• 多いおおい
  • ·many; numerous; a lot
  • ·large amount of; large quantity of; a lot; much
  • ·frequent; common
  N5
• 人ひと
  • ·person; someone; somebody
  • ·human beings; mankind; man; people; humans
  • ·human (Homo sapiens)
  • ·(other) people; others
  • ·character; personality; nature
  • ·capable person; competent person; suitable person; right person
  • ·adult; grown-up
  • ·I; me; one
  N5
• 良いよいAs it appears here: 良くない
  • ·good; excellent; fine; nice; pleasant; agreeable
  • ·sufficient; enough; ready; prepared
  • ·profitable (deal, business offer, etc.); beneficial
  • ·OK; all right; fine; no problem
  • ·easy to ...
  N5
• この
  • ·this
  • ·last (couple of years, etc.); these; past; this
  • ·you (as in "you liar")
  N5
• いろいろ
  • ·various; a variety of; all sorts of; many (different)
  • ·variously; in various ways; in many ways
  • ·various things; this and that
  N5
• それ
  • ·that; it
  • ·then; that point (in time); that time
  • ·there
  • ·you
  N5
• わかるAs it appears here: わかって
  • ·to understand; to comprehend; to grasp; to see; to get; to follow
  • ·to become clear; to be known; to be discovered; to be realized (realised); to be found out; to make sense
  • ·I know!; I think so too!
  N5
• ここ
  • ·here; this place
  • ·this point; here; now
  • ·these past ... (e.g. three years); these last ...
  • ·the next ... (e.g. few days); these next ...
  N5
• たとえば
  • ·for example; for instance; e.g.
  N4
• 技術ぎじゅつ
  • ·technology; engineering
  • ·technique; skill
  • ·art; craft
  N4
• 簡単かんたん
  • ·simple; easy; uncomplicated
  • ·brief; quick; light
  N4
• 慣れるなれるAs it appears here: 慣れて
  • ·to get used to; to grow accustomed to; to become familiar with
  • ·to become skilled in; to become experienced at
  • ·to become tame; to become domesticated
  • ·to get used to doing
  N4
• しっかり
  • ·tightly (holding on); firmly; securely
  • ·strongly (built); solidly; sturdily; steadily
  • ·properly; well; sufficiently; hard (working, etc.); fully; completely
  • ·reliably; dependably; levelheadedly; shrewdly; wisely; cleverly
  N4
• 腕うで
  • ·arm
  • ·ability; skill; talent; competence
  • ·(physical) strength
  N4
• 運ぶはこぶAs it appears here: 運び
  • ·to carry; to transport; to move; to convey
  • ·to come; to go
  • ·to use (a brush, chopsticks, etc.); to move
  • ·to carry out; to proceed with; to arrange
  • ·to go (well, etc.); to proceed; to progress
  N4
• 受けるうける
  • ·to receive; to get
  • ·to catch (e.g. a ball)
  • ·to be struck by (wind, waves, sunlight, etc.)
  • ·to sustain (damage); to incur (a loss); to suffer (an injury); to feel (influence)
  • ·to undergo (e.g. surgery); to take (a test); to accept (a challenge)
  • ·to be given (e.g. life, talent)
  • ·to find funny; to find humorous; to be amused (by)
  • ·to follow; to succeed; to be descended from
  • ·to face (south, etc.)
  • ·to be modified by
  • ·to obtain (a pawned item, etc.) by paying a fee
  • ·to be well-received; to become popular; to go down well
  N4
• 普通ふつう
  • ·normal; ordinary; regular; usual; common; average
  • ·normally; ordinarily; usually; generally; commonly
  • ·local train; train that stops at every station
  N4
• 必要ひつよう
  • ·necessary; needed; essential; indispensable
  • ·necessity; need; requirement
  N4
• 場合ばあい
  • ·case; occasion; situation; circumstances
  N4
• 考えるかんがえる
  • ·to think (about, of); to think over; to ponder; to contemplate; to reflect (on); to meditate (on)
  • ·to consider; to bear in mind; to allow for; to take into consideration
  • ·to think (that); to believe; to hold (a view); to judge; to conclude; to suspect
  • ·to intend (to do); to think of (doing); to plan
  • ·to predict; to anticipate; to expect; to imagine
  • ·to come up with; to think up; to contrive; to devise
  • ·to consider (as); to regard (as); to look on (as); to take; to view
  N4
• みつかる
  • ·to be found; to be discovered
  N4
• うち
  • ·inside; within
  • ·while (e.g. one is young); during; within (e.g. a day); in the course of
  • ·among; amongst; (out) of; between
  • ·in (secret, chaos, poverty, etc.); amidst; with (e.g. success)
  • ·within oneself; one's feelings; inner thoughts
  • ·we; our company; our organization
  • ·one's home; one's family
  • ·my spouse; my husband; my wife
  • ·signed on behalf of (husband's name) by his wife
  • ·I; me
  • ·imperial palace grounds
  • ·emperor
  N4
• 直すなおす
  • ·to repair; to mend; to fix; to correct (a mistake, bad habit, etc.); to put right; to restore; to straighten (e.g. a tie); to tidy up (one's hair, make-up, etc.); to revive (one's spirits)
  • ·to change; to alter; to convert; to translate
  • ·to put back; to put away
  • ·to cure; to heal
  • ·to move up; to promote
  • ·to do over again; to redo
  N4
• こと
  • ·thing; matter
  • ·incident; occurrence; event; something serious; trouble; crisis
  • ·circumstances; situation; state of affairs
  • ·work; business; affair
  • ·after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to
  • ·nominalizing suffix
  • ·pretending to ...; playing make-believe ...
  • ·alias; also known as; otherwise known as; or
  • ·necessity; need
  • ·you should ...; I advise that you ...; it's important to ...
  N3
• 単純たんじゅん
  • ·simple; plain; uncomplicated; straightforward; simple-minded; naive
  N3
• 運動うんどう
  • ·exercise; physical training; workout; sports; athletics
  • ·appeal; campaign; drive; crusade; movement; lobbying
  • ·motion; movement
  N3
• なかなか
  • ·very; considerably; easily; readily; fairly; quite; highly; rather
  • ·by no means; not readily
  • ·middle; half-way point
  • ·excellent; wonderful; very good
  N3
• よう
  • ·appearing ...; looking ...
  • ·way to ...; method of ...ing
  • ·form; style; design
  • ·like; similar to
  • ·thing (thought or spoken)
  N3
• 改善かいぜん
  • ·betterment; improvement
  • ·kaizen (Japanese business philosophy of continuous improvement)
  N3
• 実はじつは
  • ·as a matter of fact; by the way; to tell you the truth; to be honest; frankly; actually
  N3
• 普段ふだん
  • ·usual; normal; everyday; habitual; ordinary
  • ·usually; normally; generally; habitually; always
  N3
• 支配しはい
  • ·rule; domination; control
  • ·direction; management; guidance
  • ·control (of one's destiny, public opinion, etc.); governing; influence; sway
  • ·government
  N3
• 振るふるAs it appears here: 振り
  • ·to wave; to shake; to swing
  • ·to sprinkle; to throw (dice)
  • ·to cast (actor); to allocate (work)
  • ·to turn down (someone); to reject; to jilt; to dump
  • ·to abandon; to give up; to ruin
  • ·to add kana indicating a reading of a word
  • ·to slightly change headings; to change directions
  • ·to extract by broiling; to prepare an infusion of; to decoct
  • ·to carry with great vigor (e.g. a portable shrine)
  • ·to bring up a topic; to lead to a topic
  • ·to replace; to substitute
  • ·to set up a joke for someone else
  N3
• 膝ひざ
  • ·knee
  • ·lap; knee and thigh (while sitting)
  N3
• 指導しどう
  • ·guidance; leadership; instruction; direction; coaching
  • ·shido (minor penalty in judo)
  N3
• 修正しゅうせい
  • ·amendment; correction; revision; modification; alteration; retouching; update; fix
  N3
• 意識いしき
  • ·consciousness
  • ·becoming aware (of); awareness; sense
  • ·mano-vijnana (mental consciousness, cognizer of sensory information)
  N3
• 向けるむけるAs it appears here: 向けて
  • ·to turn (towards); to face; to point; to aim; to direct to
  • ·to head to; to go towards
  • ·to allot; to allocate
  • ·to send; to dispatch (e.g. a person)
  • ·to aim for; to pursue
  N3
• 効果こうか
  • ·effect; effectiveness; efficacy; result
  • ·effects (e.g. sound effects, visual effects, special effects)
  N3
• 解決かいけつ
  • ·settlement; solution; resolution
  N3
• 刺激しげき
  • ·stimulus; stimulation; irritation (esp. of the body, e.g. skin, eyes)
  • ·impetus; impulse; stimulus; spur; incentive; encouragement; stimulation; motivation; provocation
  • ·excitement; thrill
  N3
• 与えるあたえる
  • ·to give (esp. to someone of lower status); to bestow; to grant; to confer; to present; to award
  • ·to provide; to afford; to offer; to supply
  • ·to assign
  • ·to cause
  • ·to pass (a variable to a function)
  N3
• 有効ゆうこう
  • ·valid; effective
  • ·yuko (judo)
  N3
• 注ちゅう
  • ·annotation; explanatory note; comment
  N3
• 神経しんけい
  • ·nerve
  • ·nerves; sensitivity
  N3
• つなぐ
  • ·to connect; to link together
  • ·to tie; to fasten; to restrain
  • ·to maintain; to preserve; to keep
  • ·to transfer (phone call); to put a person through
  • ·to hedge; to buy or sell forward
  • ·to connect (stones)
  N3
• 粗いあらいAs it appears here: 粗
  • ·coarse; rough
  N3
• 動かすうごかすAs it appears here: 動かし
  • ·to move; to shift; to stir; to budge; to change position
  • ·to inspire; to rouse; to move (e.g. feeling); to influence
  • ·to change; to alter; to deny
  • ·to operate; to set in motion; to get going
  • ·to mobilize (e.g. troops); to mobilise; to deploy
  • ·to manage (e.g. funds)
  N3
• 指摘してき
  • ·pointing out; identification
  N1
• 動きうごき
  • ·movement; move; motion
  • ·trend; development; change; fluctuation
  N1
• 上がるあがるAs it appears here: 上がらない
  • ·to rise; to go up; to come up; to ascend; to be raised
  • ·to enter (esp. from outdoors); to come in; to go in
  • ·to enter (a school); to advance to the next grade
  • ·to get out (of water); to come ashore; to be washed ashore
  • ·to float atop the water; to surface from the sea (e.g. of a corpse); to rise to the surface
  • ·to increase; to be raised (e.g. of a salary); to rise
  • ·to improve; to make progress
  • ·to be promoted; to advance
  • ·to be made (of profit, etc.)
  • ·to occur (esp. of a favourable result)
  • ·to be adequate (to cover expenses, etc.)
  • ·to be finished; to be done; to be over
  • ·to stop (of rain); to clear up (of weather)
  • ·to stop (working properly); to cut out; to give out; to die
  • ·to win (in a card game, etc.)
  • ·to be spoken loudly; to be raised loudly (of a voice)
  • ·to get nervous; to get stage fright
  • ·to be offered (to the gods, etc.)
  • ·to go; to visit
  • ·to eat; to drink
  • ·to serve (in one's master's home)
  • ·to enter a red light district; to amuse oneself in a red light district; to visit a brothel
  • ·to arise vigorously (e.g. of voices in excitement); to become excited; to be in uproar (e.g. of a crowd)
  • ·to be complete; to finish
  • ·adds the connotation of an action happening strongly or violently
  • ·above; north of
  N1
• きわめて
  • ·exceedingly; extremely; decisively
  N1
• 正しくまさしく
  • ·certainly; surely; undoubtedly; evidently; really; truly
  • ·just; precisely; exactly
  N1

Example sentences are translated by AI.

• となると／となればN1

  Introduces a supposed situation and its natural consequence — 'when it comes to X', 'if it turns out to be X, then (naturally)…'.

  たとえば、「走る」ことは、一見単純で誰にでもできる運動ではあるが、「速く走る技術」となると、なかなか①身につけることが難しい。

  For example, “running” may seem like a simple form of exercise that anyone can do, but acquiring the “technique of running fast” is actually quite difficult.

• 例えば（たとえば）N3

  Introduces an illustrative instance, 'for example / for instance'.

  たとえば、「走る」ことは、一見単純で誰にでもできる運動ではあるが、「速く走る技術」となると、なかなか①身につけることが難しい。

  For example, “running” may seem like a simple form of exercise that anyone can do, but acquiring the “technique of running fast” is actually quite difficult.

• なかなかN3

  An adverb meaning "quite / considerably", or with a following negative verb "not easily / just won't".

  たとえば、「走る」ことは、一見単純で誰にでもできる運動ではあるが、「速く走る技術」となると、なかなか①身につけることが難しい。

  For example, “running” may seem like a simple form of exercise that anyone can do, but acquiring the “technique of running fast” is actually quite difficult.

• に対してN3

  Marks the target or object an action is directed at, or sets up a contrast between two things, 'toward / with regard to / in contrast to'.

  実は、普段慣れている動作ほど、その動作に対する神経支配がしっかりとできあがっているからだ。

  In fact, the more familiar a movement is in everyday life, the more firmly established the neural control governing that movement becomes.

• というN3

  Quotative marker plus 'say' that introduces a name, definition, or reported content — 'called', 'known as', 'that (one) says'.

  そして、トレーニングの効果が上がらない人は、「運動神経」が良くないということになる。

  Those who fail to benefit from training are then said to have poor “athletic coordination.”

• によって/によるN3

  Marks means, cause, passive agent, or a factor something depends on; 'by (means of)', 'due to', 'depending on'.

  ②この場合、運動技術の修正は、「運動の神経回路を修正する」ことであると考えることによって、解決の糸口がみつかる。

  In this case, viewing the correction of athletic technique as “correcting the neural circuits for movement” can provide a clue to solving the problem.

• 〜のにN42 times in this passage

  Links two clauses so the result contradicts what the first clause leads you to expect — "even though ~ / although ~".

  誰でもできる運動なのに、なぜその改善が難しいのだろう。

  If it is an activity anyone can do, why is it so difficult to improve?

• ことになるN42 times in this passage

  Expresses that something has been decided or comes about, often through external circumstances rather than the speaker's own will; 'it has been decided that / it turns out that.'

  運動の技術やフォームを改善することは、その運動を支配する神経回路を組みかえることになるので、そう簡単にはいかない。

  Improving the technique or form of a movement means reorganizing the neural circuits that control it, so it is not something that can be done easily.

• などN4

  Lists one or more representative items and implies others of the same kind exist — 'and so on / etc. / such as'.

  コーチは、腕の振り、膝の運び方、上体の前傾の取り方など、フォームを矯正しようと指導し、指導を受けるランナーも指摘された体の動きの修正に意識を向けてトレーニングするのが普通である。

  Coaches normally instruct runners on correcting their form, such as how to swing their arms, move their knees, or lean their upper bodies forward, while the runners train by consciously trying to correct the body movements that have been pointed out.

• が必要（がひつよう）N42 times in this passage

  Marks something as necessary or required — 'need X / X is necessary'.

  しかし、動作の修正には多くの時間と繰り返しが必要であり、またその効果が上がらないことも多い。

  However, correcting a movement requires a great deal of time and repetition, and in many cases the desired results still fail to appear.

• ようだN4

  Expresses conjecture or resemblance drawn from evidence, "it seems / looks like".

  スポーツ技術や「身のこなし」の習得には、神経回路に直接的に刺激を与えるようなトレーニング上の工夫が必要である。

  Acquiring sports techniques and skillful body movement requires training methods designed to stimulate neural circuits directly.

• 〜てくるN4

  Verb te-form plus 来る, marking motion toward the speaker or the gradual onset of a state — 'come to do' / 'start to / become'.

  工夫をいろいろと重ねるうちに、「動作をイメージし、それを体感する」ことが、運動の神経回路を改善するのにきわめて有効であることがわかってきた。

  After trying various approaches, it became clear that “visualizing a movement and then experiencing it physically” is extremely effective for improving the neural circuits involved in movement.

• じゃない・ではないN5

  Negates a noun or na-adjective with the copula, "is not / am not".

  教えられたように走るフォームを改善することが簡単ではないからだ。

  This is because improving one’s running form exactly as instructed is not easy.

• だろうN5

  Presumptive expressing conjecture — 'probably', 'I think', or seeking agreement 'right?'; plain だろう / polite でしょう.

  誰でもできる運動なのに、なぜその改善が難しいのだろう。

  If it is an activity anyone can do, why is it so difficult to improve?

• 〜ているN52 times in this passage

  Describes an action in progress or the state that remains after an action happened — “is doing” or “is in the state of having done”.

  実は、普段慣れている動作ほど、その動作に対する神経支配がしっかりとできあがっているからだ。

  In fact, the more familiar a movement is in everyday life, the more firmly established the neural control governing that movement becomes.

• のでN5

  Gives a reason or cause with a soft, objective/polite nuance — 'because / since'.

  運動の技術やフォームを改善することは、その運動を支配する神経回路を組みかえることになるので、そう簡単にはいかない。

  Improving the technique or form of a movement means reorganizing the neural circuits that control it, so it is not something that can be done easily.

• しかしN5

  Contrastive conjunction joining two sentences, 'however / but'.

  しかし、動作の修正には多くの時間と繰り返しが必要であり、またその効果が上がらないことも多い。

  However, correcting a movement requires a great deal of time and repetition, and in many cases the desired results still fail to appear.

• そしてN5

  Additive/sequential conjunction joining clauses, 'and / and then'.

  そして、トレーニングの効果が上がらない人は、「運動神経」が良くないということになる。

  Those who fail to benefit from training are then said to have poor “athletic coordination.”