How long your muscles are working during a lift matters just as much as how heavy the weight is for building muscle, burning energy, and improving nerve-muscle control.

Evidence from Studies

Supporting (1)

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When duration matters: rethinking resistance training load through time under tension

Editorial/Opinion

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Source Study

When duration matters: rethinking resistance training load through time under tension

DOI: 10.1590/1980-0037.2025v27e107589

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In people who regularly lift weights, the amount of time muscles are under strain during bench presses correlates with how much total work is done and how many repetitions are completed, indicating that measuring this time could be a useful way to estimate workout volume when tracking weight and distance is not possible.

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Your muscles grow bigger mainly because of how much total force they feel over time—not whether you do your workouts all at once or spread out over the week.

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Your muscles grow bigger mainly because of how much total force they feel over time—not whether you do your workouts all at once or spread out over the week.

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