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Exercise yields nine distinct adaptations - physical training can be dialed into specific goals like power, hypertrophy, or endurance, though over-prioritizing one can sometimes hinder progress in another.
“There's about nine different adaptations you can get from exercise... some of those cross over and some are actually a little bit contrary to the other ones.”
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Progressive overload is the engine of adaptation - physiological change only occurs as a byproduct of stress, requiring intentional increases in weight, volume, or complexity over time.
“If you want to continue to improve, you have to have some method of overload. Adaptation physiologically happens as a byproduct of stress.”
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Muscle soreness is a poor indicator of workout quality - chasing extreme soreness is counterproductive as it forces skipped sessions and lowers the total training frequency necessary for long-term gains.
“Soreness is a terrible proxy for exercise quality. It's a really bad way to estimate whether it was a good or a bad workout.”