Even though your body releases muscle-building hormones like testosterone after a workout, those spikes don’t actually help you grow bigger muscles over time—no matter if you’re a man or woman, or whether you’re new to lifting or a seasoned athlete.

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Evidence from Studies

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Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Narrative Review

2025 Nov 21

This study says that even though your body releases muscle-building hormones after working out, those hormones don’t actually make your muscles grow bigger—what matters is how hard you lift, not how much hormone you pump out.

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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

Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Score: 1

DOI: 10.1016/j.jshs.2025.101104

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