Your typical B2M (boy to man) transformation. EASILY achievable by any adolescent going through puberty. There got to be a million just like this on bb.com.
He would look similar even if he didn't lift & you can tell he's a boy in the before pic. Do this at 30/40yrs old ill be impresses. But not boy to man, not impressed sorry. If he was on PED's he'd be twice that size.