What does the research say about the effectiveness of pre-workout supplements?
A 2019 review indicated that pre-workout supplements with stimulant blends can enhance acute performance by 6-19% compared to placebo. However, the benefits diminish after a few weeks due to CNS tolerance, meaning users may not experience long-term adaptations.
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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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