Tom and Jerry both practice tennis for 100 hours. Tom plays matches for fun. Jerry drills his weak backhand. Who gets better?

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Tom is doing "Naive Practice"—just repeating what he already knows how to do. This maintains skill, but it doesn't improve it.

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Once you reach a "good enough" level, doing more of the same just hardens your habits (including bad ones!). Tom will hit a plateau and stay there forever.

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You may have heard "practice makes perfect." That's wrong. "Perfect practice makes perfect." Doing the wrong thing for 100 hours just makes you an expert at doing it wrong.

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Studies show that doctors with 20 years of experience are sometimes worse than new doctors. Why? Because if they don't get feedback, they repeat mistakes for 20 years.

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Jerry is doing Deliberate Practice. This has 4 key parts:

1. A specific goal (fix backhand)

2. Intense focus

3. Immediate feedback (did it work?)

4. Staying outside the comfort zone

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Learning happens when you struggle. If it feels easy (like Tom's match), you aren't learning. Jerry's practice feels frustrating and hard—that's the feeling of neurons connecting.

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Jerry gets instant data: "Ball hit net. Aim higher." Tom just plays. Without specific feedback on valid mistakes, you can't correct the underlying error.