シャドーイング練習: The Brain-Changing Benefits of Exercise | Wendy Suzuki | TED - YouTubeで英語スピーキングを学ぶ
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What if I told you there was something that you can do right now that would have an immediate, positive benefit for your brain including your mood and your focus?
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What if I told you there was something that you can do right now that would have an immediate, positive benefit for your brain including your mood and your focus?
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And what if I told you that same thing could actually last a long time and protect your brain from different conditions like depression, Alzheimer's disease or dementia.
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Would you do it?
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Yes! I am talking about the powerful effects of physical activity.
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Simply moving your body, has immediate, long-lasting and protective benefits for your brain.
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And that can last for the rest of your life.
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So what I want to do today is tell you a story about how I used my deep understanding of neuroscience, as a professor of neuroscience, to essentially do an experiment on myself in which I discovered the science underlying why exercise is the most transformative thing that you can do for your brain today.
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Now, as a neuroscientist, I know that our brains, that is the thing in our head right now, that is the most complex structure known to humankind.
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But it's one thing to talk about the brain, and it's another to see it.
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So here is a real preserved human brain.
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And it's going to illustrate two key areas that we are going to talk about today.
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The first is the prefrontal cortex, right behind your forehead, critical for things like decision-making, focus, attention and your personality.
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The second key area is located in the temporal lobe, shown right here.
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You have two temporal lobes in your brain, the right and the left, and deep in the temporal lobe is a key structure critical for your ability to form and retain new long-term memories for facts and events.
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And that structure is called the hippocampus.
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So I've always been fascinated with the hippocampus.
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How could it be that an event that lasts just a moment, say, your first kiss, or the moment your first child was born, can form a memory that has changed your brain, that lasts an entire lifetime?
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That's what I want to understand.
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I wanted to start and record the activity of individual brain cells in the hippocampus as subjects were forming new memories.
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And essentially try and decode how those brief bursts of electrical activity, which is how neurons communicate with each other, how those brief bursts either allowed us to form a new memory, or did not.
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But a few years ago, I did something very unusual in science.
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As a full professor of neural science, I decided to completely switch my research program.
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Because I encountered something that was so amazing, with the potential to change so many lives that I had to study it.
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I discovered and I experienced the brain-changing effects of exercise.
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And I did it in a completely inadvertent way.
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I was actually at the height of all the memory work that I was doing -- data was pouring in, I was becoming known in my field for all of this memory work.
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And it should have been going great. It was, scientifically.
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But when I stuck my head out of my lab door, I noticed something.
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I had no social life.
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I spent too much time listening to those brain cells in a dark room, by myself.
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(Laughter) I didn't move my body at all.
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I had gained 25 pounds.
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And actually, it took me many years to realize it, I was actually miserable.
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And I shouldn't be miserable.
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And I went on a river-rafting trip -- by myself, because I had no social life.
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And I came back -- (Laughter) thinking, "Oh, my God, I was the weakest person on that trip." And I came back with a mission.
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I said, "I'm never going to feel like the weakest person on a river-rafting trip again." And that's what made me go to the gym.
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And I focused my type-A personality on going to all the exercise classes at the gym.
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I tried everything.
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I went to kickbox, dance, yoga, step class, and at first it was really hard.
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But what I noticed is that after every sweat-inducing workout that I tried, I had this great mood boost and this great energy boost.
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And that's what kept me going back to the gym.
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Well, I started feeling stronger.
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I started feeling better, I even lost that 25 pounds.
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And now, fast-forward a year and a half into this regular exercise program and I noticed something that really made me sit up and take notice.
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I was sitting at my desk, writing a research grant, and a thought went through my mind that had never gone through my mind before.
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And that thought was, "Gee, grant-writing is going well today." And all the scientists -- (Laughter) yeah, all the scientists always laugh when I say that, because grant-writing never goes well.
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It is so hard; you're always pulling your hair out, trying to come up with that million-dollar-winning idea.
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But I realized that the grant-writing was going well, because I was able to focus and maintain my attention for longer than I had before.
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And my long-term memory -- what I was studying in my own lab -- seemed to be better in me.
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And that's when I put it together.
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Maybe all that exercise that I had included and added to my life was changing my brain.
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Maybe I did an experiment on myself without even knowing it.
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So as a curious neuroscientist, I went to the literature to see what I could find about what we knew about the effects of exercise on the brain.
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And what I found was an exciting and a growing literature that was essentially showing everything that I noticed in myself.
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Better mood, better energy, better memory, better attention.
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And the more I learned, the more I realized how powerful exercise was.
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Which eventually led me to the big decision to completely shift my research focus.
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And so now, after several years of really focusing on this question, I've come to the following conclusion: that exercise is the most transformative thing that you can do for your brain today for the following three reasons.
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Number one: it has immediate effects on your brain.
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A single workout that you do will immediately increase levels of neurotransmitters like dopamine, serotonin and noradrenaline.
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That is going to increase your mood right after that workout, exactly what I was feeling.
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My lab showed that a single workout can improve your ability to shift and focus attention, and that focus improvement will last for at least two hours.
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And finally, studies have shown that a single workout will improve your reaction times which basically means that you are going to be faster at catching that cup of Starbucks that falls off the counter, which is very, very important.
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(Laughter) But these immediate effects are transient, they help you right after.
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What you have to do is do what I did, that is change your exercise regime, increase your cardiorespiratory function, to get the long-lasting effects.
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And these effects are long-lasting because exercise actually changes the brain's anatomy, physiology and function.
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Let's start with my favorite brain area, the hippocampus.
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The hippocampus -- or exercise actually produces brand new brain cells, new brain cells in the hippocampus, that actually increase its volume, as well as improve your long-term memory, OK?
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And that including in you and me.
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Number two: the most common finding in neuroscience studies, looking at effects of long-term exercise, is improved attention function dependent on your prefrontal cortex.
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You not only get better focus and attention, but the volume of the hippocampus increases as well.
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And finally, you not only get immediate effects of mood with exercise but those last for a long time.
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So you get long-lasting increases in those good mood neurotransmitters.
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But really, the most transformative thing that exercise will do is its protective effects on your brain.
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Here you can think about the brain like a muscle.
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The more you're working out, the bigger and stronger your hippocampus and prefrontal cortex gets.
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Why is that important?
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Because the prefrontal cortex and the hippocampus are the two areas that are most susceptible to neurodegenerative diseases and normal cognitive decline in aging.
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So with increased exercise over your lifetime, you're not going to cure dementia or Alzheimer's disease, but what you're going to do is you're going to create the strongest, biggest hippocampus and prefrontal cortex so it takes longer for these diseases to actually have an effect.
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You can think of exercise, therefore, as a supercharged 401K for your brain, OK?
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And it's even better, because it's free.
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So this is the point in the talk where everybody says, "That sounds so interesting, Wendy, but I really will only want to know one thing.
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And that is, just tell me the minimum amount of exercise I need to get all these changes." (Laughter) And so I'm going to tell you the answer to that question.
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First, good news: you don't have to become a triathlete to get these effects.
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The rule of thumb is you want to get three to four times a week exercise minimum 30 minutes an exercise session, and you want to get aerobic exercise in.
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That is, get your heart rate up.
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And the good news is, you don't have to go to the gym to get a very expensive gym membership.
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Add an extra walk around the block in your power walk.
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You see stairs -- take stairs.
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And power-vacuuming can be as good as the aerobics class that you were going to take at the gym.
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So I've gone from memory pioneer to exercise explorer.
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From going into the innermost workings of the brain, to trying to understand how exercise can improve our brain function, and my goal in my lab right now is to go beyond that rule of thumb that I just gave you -- three to four times a week, 30 minutes.
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I want to understand the optimum exercise prescription for you, at your age, at your fitness level, for your genetic background, to maximize the effects of exercise today and also to improve your brain and protect your brain the best for the rest of your life.
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But it's one thing to talk about exercise, and it's another to do it.
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So I'm going to invoke my power as a certified exercise instructor, to ask you all to stand up.
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(Laughter) We're going to do just one minute of exercise.
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It's call-and-response, just do what I do, say what I say, and make sure you don't punch your neighbor, OK?
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Music! (Upbeat music) Five, six, seven, eight, it's right, left, right, left.
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And I say, I am strong now.
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Let's hear you.
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Audience: I am strong now.
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Wendy Suzuki: Ladies, I am Wonder Woman-strong.
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Let's hear you!
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Audience: I am Wonder Woman-strong.
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WS: New move -- uppercut, right and left.
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I am inspired now. You say it!
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Audience: I am inspired now.
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WS: Last move -- pull it down, right and left, right and left.
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I say, I am on fire now! You say it.
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Audience: I am on fire now.
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WS: And done! OK, good job!
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(Applause) Thank you.
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I want to leave you with one last thought.
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And that is, bringing exercise in your life will not only give you a happier, more protective life today, but it will protect your brain from incurable diseases.
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And in this way it will change the trajectory of your life for the better.
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Thank you very much.
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(Applause) Thank you.
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(Applause)
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このレッスンについて
このレッスンでは、Wendy Suzuki教授のTEDトーク「The Brain-Changing Benefits of Exercise」に基づいて、運動が脳に与える影響について学びます。運動が気分や集中力に与える即時的かつ持続的な効果についての具体例を通じて、身体を動かすことの重要性を理解することができます。この学習を通して、語彙の習得や文法パターンの練習ができるだけでなく、実際のスピーキングの文脈に応じた表現も学ぶことができます。
重要な語彙とフレーズ
- brain-changing benefits - 脳に変化をもたらす利点: 脳に多くの良い影響を与えること。
- immediate positive benefit - 即時的な良い効果: 短時間で得られるプラスの影響。
- protect your brain - 脳を守る: 脳の健康を維持するための活動。
- long-term memory - 長期記憶: 長期間保持することができる記憶。
- decision-making - 意思決定: 選択肢の中から最適なものを選ぶプロセス。
- focus and attention - 集中力と注意: ある物事に意識を向け、持続させる能力。
- energy boost - エネルギーの高まり: 活力を増すこと。
- transformative effect - 変革的な効果: 大きな変化をもたらす影響。
この動画の練習のコツ
この動画の内容を使ったシャドーイング練習では、以下の点に注意しましょう。まず、話速については、最初は少し遅めに聞き取り、理解を深めていくことをおすすめします。自分の話す時も、相手に明確に聞こえるスピードを心掛けましょう。次に、アクセントに注目し、重要なフレーズを強調して発音する練習をしてください。「brain-changing benefits」や「immediate positive benefit」などのキーとなるフレーズをしっかりと発音できるようになると、英語の流暢さが向上します。
最後に、トピックの難易度についてですが、運動や脳の健康という身近なテーマであるため、比較的理解しやすい内容です。この内容を通じて、英語スピーキング練習や発音練習も行うことができる良い機会です。IELTS対策としても、リスニングやスピーキング能力を向上させるために役立つでしょう。
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。
ShadowingEnglishでの効果的な学習方法
- 動画を選ぶ: 自然で明瞭な英語が使われているYouTube動画を選びましょう。TED Talks、BBC News、映画のシーン、ポッドキャスト、IELTS模範解答などが最適です。URLをコピーして検索バーに貼り付けてください。短い動画（5分以内）や、自分が本当に興味を持てるテーマから始めるのがコツです。
- まず聞いて内容を理解する: 最初は1倍速でただ聞くだけにしましょう。まだ繰り返す必要はありません。文の意味を理解し、話者がどのように単語を強調し、音を繋げ、間を取っているかに注目してください。内容を把握してからシャドーイングに入ると、はるかに効果的です。
- シャドーイングモードを設定する:
- Wait Mode（待機モード）:
+3sまたは+5sを選ぶと、動画が一文を読み終えた後に自動で一時停止し、繰り返す時間が生まれます。完全に手動でコントロールしたい場合はManualを選んでNextを自分で押しましょう。 - Sub Sync（字幕同期）: YouTubeの字幕と音声がずれることがあります。
±100msで調整して、正確なタイミングで追えるようにしてください。
- Wait Mode（待機モード）:
- 声に出してシャドーイングする（最重要）: ここが練習の本質です。文が流れると同時に——または一時停止中に——はっきりと自信を持って声に出して繰り返しましょう。ただ単語を読むだけでなく、話者のリズム、強調、高低、連音をそっくりそのまま真似することが大切です。「影」のように話者に重なるのが理想。Repeat機能を使って同じ文を何度も繰り返し、自然に出てくるまで定着させましょう。
- 徐々に難易度を上げて続ける: 一つのパッセージに慣れたら、さらに挑戦してみましょう。速度を <code>1.25x</code> や <code>1.5x</code> に上げれば、高速の言語反射を鍛えられます。Wait Modeを <code>Off</code> にして連続シャドーイングするのが最も上級で効果的なモードです。毎日15〜30分継続すれば、数週間で目に見える変化を実感できます。