What exactly happens to the body when one “fills out”? I’m talking about how one’s body supposedly changes from when one is 20 something to when one is 30 something – thicker chest, etc. Or are the changes simply a result of gaining weight from fat?
Do skeletal structures change? How could they at that point?
I am curious because I am in my mid 30’s yet sometimes still mistaken for being in college. I am in pretty decent shape, with low body fat, and still weight what I did in college, but I wonder if it goes beyond this. My friend recently observed that I don’t seem to have “filled out”. So is that a good thing (no gain of fat) or a bad thing (underdevelopment of the frame?)