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In this instructional segment, the speaker emphasizes that time under tension (TUT) is a crucial variable for muscle hypertrophy. Maintaining continuous muscle tension throughout a set maximizes metabolic stress, which triggers a cascade of anabolic signals. The speaker illustrates how brief resting points—such as pausing at the top of a squat or letting the arm rest on the thigh during a biceps curl—allow the muscle to relax, reducing metabolic stress and diminishing the hypertrophic stimulus. The core message is that longer TUT provides more stimulus for muscle growth.
