Skeletal muscle growth in response to training is determined by genetics, and a rare version of the MSTN gene.

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

MSTN: AA

87%

MSTN: GA

11%

MSTN: GG

2%

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