How does the body adapt to training, and why is it important to change workout routines?
The body adapts to training by becoming more efficient at handling the stress of workouts, which can lead to a plateau in progress. To continue making gains, it is important to periodically change workout routines to provide new stimuli for muscle growth.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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