Day 24: The 4% Rule (Managing Difficulty)
If you leave practice feeling good because you "didn't make any mistakes," you wasted your time. Zero mistakes means you practiced what you already know.
The 85% Rule: A study titled The Eighty Five Percent Rule for Optimal Learning shows that the fastest rate of learning happens when you succeed 85% of the time and fail 15% of the time.
- If you fail 50% of the time, you quit (too hard).
- If you fail 0% of the time, you stagnate (too easy).
- Action: Adjust the difficulty until you are failing 1 out of every 6 reps. That is the biological signal for Neuroplasticity (Brain Growth).
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