Analysis Version
v1
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quantitative
Analysis v1
Strong Support

Lifting weights fast or slow doesn’t make much difference in how much your muscles grow — the extra gain from going slow is practically nothing.

50
Pro
0
Against

Evidence from Studies

Supporting (2)

50

Community contributions welcome

50

Effect of Repetition Duration During Resistance Training on Muscle Hypertrophy: A Systematic Review and Meta-Analysis

Systematic Review With Meta-Analysis
Human
2015 Apr

This study found that whether you lift weights slowly or quickly (as long as it’s not super slow), your muscles grow about the same amount — so the speed doesn’t really matter for building muscle.

39

How Slow Should You Go? A Systematic Review With Meta-Analysis of the Effect of Resistance Training Repetition Tempo on Muscle Hypertrophy

Systematic Review With Meta-Analysis
Human

This study found that whether you lift weights slowly or quickly, your muscles grow about the same amount — so speeding up or slowing down your reps doesn’t really make a difference in building muscle size.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

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.

Similar Assertions

Whether you lift weights slowly or quickly, you’re probably not going to build more muscle with one over the other — the difference is so tiny it doesn’t really matter in real life.

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Whether you lift weights slowly or quickly, you’re probably not going to build more muscle with one over the other — the difference is so tiny it doesn’t really matter.

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Lifting weights fast or slow doesn’t really make a difference in how much your muscles grow — the tiny difference you might see is so small it probably doesn’t matter.

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Whether you lift weights slowly or quickly, as long as everything else stays the same, you’ll likely build about the same amount of muscle—so how fast you move the weight might not matter much.

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86%

Whether you lift weights slowly or quickly, you’re likely to gain about the same amount of muscle — the speed doesn’t seem to make a big difference.

39
0
86%

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