Doing a full squat or starting a bicep curl from the bottom makes your muscles grow more at the far ends (like the top of your thigh or the outer part of your bicep) than doing partial reps from the top.

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Evidence from Studies

Supporting (1)

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The interplay between muscle length, range of motion, and exercise selection: a review

Narrative Review

This study says that lifting weights through a full or starting range of motion makes muscles grow better because it stretches them more while still pushing hard—exactly what the claim says.

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No contradicting evidence found

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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.

Source Study

The interplay between muscle length, range of motion, and exercise selection: a review

Score: 1

DOI: 10.1055/a-2733-7605

Similar Assertions

Some studies say doing arm exercises with shorter movements builds more muscle in the triceps, while others think full movements might help the biceps more—but we just don’t know for sure what’s best yet.

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Even if you lift heavier weights with your muscles mostly bent, you don’t grow bigger muscles than if you lift lighter weights with your muscles stretched out — the stretch matters more than how heavy the weight is.

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