20.1lbs of fat / 148lbs bodyweight = 0.136 - i.e. 13.6% bodyfat so that checks out.
The skeletal muscle mass is probably just an estimate along the lines of:
total mass - fat mass - mass of skeleton, blood, internal organs etc = muscle mass
20.1lbs of fat / 148lbs bodyweight = 0.136 - i.e. 13.6% bodyfat so that checks out.
The skeletal muscle mass is probably just an estimate along the lines of:
total mass - fat mass - mass of skeleton, blood, internal organs etc = muscle mass
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