So he can't build
I couldn't say. His best chance is to find a good instructor who could evaluate him. and create a personalised diet and routine.
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So how can make this chest normal.
By performing exercises- Shoulder pullovers, bench presses, push-ups, etc
Yeah he might have.. So is this not gynecomastia?
I'm not a medical professional so there's no way for me to know if he has that or not and I'm pretty sure a doctor would have to actually examine him to find out