Doing a special warm-up before lifting weights lets you finish your workout faster while still building just as much muscle.
Evidence from Studies
Supporting (1)
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Effects of Pre-exhaustion Versus Traditional Resistance Training on Training Volume, Maximal Strength, and Quadriceps Hypertrophy
The study found that pre-exhaustion training takes less time but still builds muscle just as well as regular training, which matches the claim.
Contradicting (2)
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The study compared pre-exhaustion training to other methods with the same total workout volume and found it didn't work better or save time, so it contradicts the claim that pre-exhaustion shortens workouts while keeping muscle gains.
The study looked at pre-exhaustion training and found it doesn't help muscle growth more than regular training, so it contradicts the claim that it saves time while keeping muscle gains.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.