You can't really grow bigger muscles until you've done about 18 weightlifting sessions—your body needs time to adapt before it starts building real muscle.

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Evidence from Studies

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The development of skeletal muscle hypertrophy through resistance training: the role of muscle damage and muscle protein synthesis

Narrative Review

2018 Mar

This study says your muscles don’t really grow bigger until you’ve worked out with weights about 18 times — before that, any size increase is just swelling, not real muscle growth.

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Source Study

The development of skeletal muscle hypertrophy through resistance training: the role of muscle damage and muscle protein synthesis

Score: 1

DOI: 10.1007/s00421-017-3792-9

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