シャドーイング練習: What actually makes muscles grow - 動画で英語スピーキングを学ぶ
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104 文
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You don't build muscle at the gym.
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You break it there.
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The building happens after.
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While you're sitting at your desk.
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While you're sleeping.
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While you're doing absolutely nothing.
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And most people are completely screwing up that part.
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When you train, this is what's actually happening inside your muscles.
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Your brain sends a signal.
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Motor neurons fire.
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Muscle fibers contract.
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And when the load is heavy enough, your body recruits bigger, more powerful fibers, the ones with actual growth potential.
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Most people understand that part.
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What they get wrong is when muscle fiber is under load.
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Especially while it's lengthening, it physically deforms.
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The fiber senses that tension, triggers a molecular signal called MTORC1.
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And that signal tells your body to start building new protein, more protein, bigger fiber.
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That's hypertrophy.
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A 2025 review out of McMaster University, one of the top sports science programs in the world, confirmed that your muscle doesn't need to be torn to grow.
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It just needs to be loaded, which means it's the tension that does the work and not the damage you are so eager to flex.
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So that soreness you've been chasing?
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Inflammation.
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Your body is cleaning up.
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It's not a growth signal.
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Marathon runners are destroyed for a week after a race.
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They don't come back with bigger legs.
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Where it gets worse for you specifically is this next part.
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Muscle protein synthesis, the actual building process, peaks around 24 hours after your session.
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By 48 hours, it's basically back to baseline.
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Done.
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Window closed.
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So if you're training pull-ups on Monday and not touching your back again until next Monday, your muscles were growing for two days, then sitting there for five.
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That soreness you still feel on Thursday?
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That's just your body still doing cleanup while the construction crew already went home.
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Each muscle twice a week isn't just better.
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It's the difference between your muscles spending two days growing, or four.
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And the lowering part of every rep.
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That's where you're leaving the most on the table.
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Your muscles can handle about 40% more force on the way down than on the way up.
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The lowering phase of a pull-up, the descent of a dip.
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That's where the tension is highest.
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That's where MTORC1 gets hit hardest.
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Most people treat the lowering like it's the commute between reps.
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Drop down fast, pull up again, count the rep.
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But the rep you counted?
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Your muscles cared most about the part you rushed.
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Slow the lowering down, three seconds minimum.
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Your gains are going banana just from that one change.
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One bad night of sleep reduces muscle protein synthesis by 18%.
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Not a week of bad sleep.
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One night.
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One week of sleeping five hours drops your testosterone by 10 to 15 percent.
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Same decline you'd expect from aging 10 years, in one week.
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There was a study where two groups ate the exact same diet, same calorie deficit.
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The only difference was sleep.
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The group sleeping less lost 60% more muscle and 55% less fat.
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Same food, different results.
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You've been tracking your protein down to the gram.
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You slept 6 hours and scrolled until 1am.
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That's the problem.
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Sleep is half the recovery equation.
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The other half is protein.
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And most people are getting this wrong too.
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mTorq1 just told your body to build new muscle, but it needs raw materials.
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If your protein is off, that signal fires and nothing gets built.
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You basically paid for a construction crew and forgot to order the materials.
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The problem is most people have no idea how much they're actually eating.
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Studies show people underestimate their food intake by up to 50%.
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You think you're eating 2,000 calories.
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You're eating 3,000.
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Or the opposite.
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You think you're eating enough protein, but you're not.
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Macrofactor fixes this.
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It's a nutrition app that tracks your food, learns your metabolism, and adjusts your targets every week based on how your body is actually responding.
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It also adjusts every week.
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So if your metabolism slows down or speeds up, the plan moves with it.
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Not stuck on the numbers you entered on day one.
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It builds around you, not the other way around.
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A photologging makes it easy.
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Snap your plate, it calculates the macros.
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Use code YELLOWDUDE for a free 14-day trial.
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Link in the description.
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Load your muscles progressively, harder over time, not just more reps of the same thing.
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Body weight doesn't mean you can't progressively overload.
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Harder variations, slower eccentrics, weighted vest.
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Your muscles need increasing tension.
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Same pull-ups forever is not progressive overload.
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That's just maintenance.
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Slow the lowering phase on every rep, three seconds down every set.
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Sleep.
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Minimum seven hours.
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This isn't a lifestyle tip, it's literally where the growth happens.
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For the full breakdown of sets, frequency, how many days, we already covered that.
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Your soreness will peak around day two, and hang around until day three or four.
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Your muscles finished building around hour 48.
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They were done before your soreness even peaked.
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So next time you limp out of a session thinking you crushed it, you probably did.
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But the crushing part is over.
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What happens in the next 48 hours is the whole game, and most people spend those 48 hours sleeping badly,
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skipping protein, and waiting to feel less sore before they train again.
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Your muscles don't grow because they hurt, they grow because you loaded them, fed them, and got out of the way.
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Feed it right with the help of Macrofactor.
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Code YellowDude.
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Links in the description.
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このレッスンの語彙とスピーキングのポイント
このB2レベルのスピーキングレッスンは、動画「What actually makes muscles grow」を教材にしています。 繰り返し出てくる語は次のとおりです：muscle, protein, hour, rep, lowering。 この動画には、シャドーイング用の文が104文、単語が913語あります。 音声の長さは6:20です。 話す速さは1分あたり約144語で安定しており、シャドーイングしやすいペースです。 単語の82%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。
この動画の重要語彙
動画の中で特に難しい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| calorie 名詞 | /ˈkæləɹi/ | カロリー |
| metabolism 名詞 | /məˈtæb.əˌlɪz.əm/ | 代謝, 新陳代謝 |
| synthesis 名詞 | /ˈsɪnθəsɪs/ | 統合, 総合 |
| adjust 動詞 | /əˈd͡ʒʌst/ | 調整する |
| crush 動詞 | /kɹʌʃ/ | 砕く |
| deform 動詞 | /dəˈfɔɹm/ | 歪める |
| hypertrophy 名詞 | /haɪˈpɜɹ.tɹə.fi/ | 肥大 |
| lengthen 動詞 | /ˈlɛŋθən/ | 延ばす, 長くする |
| neuron 名詞 | /ˈn(j)ʊɹɑn/ | 神経細胞 |
| testosterone 名詞 | /tɛˈstɑ.stəˌɹoʊn/ | テストステロン |
| underestimate 動詞 | /ʌndɚˈɛs.tɪ.meɪt/ | 過小評価する, 侮る |
| macro 名詞 | /ˈmæk.ɹoʊ/ | マクロ |
| vest 名詞 | /vɛst/ | チョッキ, ベスト |
| inflammation 名詞 | /ɪnfləˈmeɪ̯ʃən/ | 炎症 |
| gram 名詞 | /ˈɡɹæm/ | グラム |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| pull up 動詞 | /ˌpʊl ˈʌp/ | 引き上げる |
| clean up 動詞 | 掃除する | |
| slow down 動詞 | 遅らせる | |
| speed up 動詞 | /spiːdˈʌp/ | スピードを出す |
繰り返し練習したい文
動画に出てくる短く完結した文です。日常会話でそのまま使えます。
- You don't build muscle at the gym.
- While you're sitting at your desk.
- While you're doing absolutely nothing.
- So that soreness you've been chasing?
- That's where you're leaving the most on the table.
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 現在完了進行形 have/has been + -ing — 以前に始まり今も続いている動作 | you've been chasing · You've been tracking |
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | be torn · be loaded · are destroyed |
注意したい発音
話し手はyou're, don't, doesn'tなど、短縮形や弱形を21回使っています。聞こえたとおりの短い形で発音しましょう。
- 「th」の音: synthesis /ˈsɪnθəsɪs/, lengthen /ˈlɛŋθən/, marathon /ˈmæɹəθən/
- 「sh」と「zh」の音: crush /kɹʌʃ/, inflammation /ɪnfləˈmeɪ̯ʃən/, equation /ɪˈkweɪ.ʒən/, variation /ˌvɛəɹiˈeɪʃn̩/, nutrition /njuːˈtɹɪʃ.ən/
- 長い単語（アクセントの位置に注意）: progressively /pɹəˈɡɹɛsɪvli/, metabolism /məˈtæb.əˌlɪz.əm/, hypertrophy /haɪˈpɜɹ.tɹə.fi/, testosterone /tɛˈstɑ.stəˌɹoʊn/, underestimate /ʌndɚˈɛs.tɪ.meɪt/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: progressively /pɹəˈɡɹɛsɪvli/, calorie /ˈkæləɹi/, scroll /skɹoʊl/, molecular /məˈlɛk.jə.ləɹ/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: overload /ˌəʊvəˈləʊd/, progressively /pɹəˈɡɹɛsɪvli/, vest /vɛst/, variation /ˌvɛəɹiˈeɪʃn̩/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: fiber /ˈfaɪ.bɚ/, deform /dəˈfɔɹm/, hypertrophy /haɪˈpɜɹ.tɹə.fi/, inflammation /ɪnfləˈmeɪ̯ʃən/, flex /flɛks/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
- 自分の声を録音して元の音声と比べます。calorie, metabolism, synthesisなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。