When we met I was skinny AF. I started gym and now I no more feel awkward when I see pictures with me and her. But the main profit of gym is in my mind. I'm more tolerant about everything. When people do shit I can act with a clear mind and without mental agression.
It can be surprising what exercise can do for your head. It seems to be something purely physical, but it has certainly made me more active in other ways. It's easier to say "yes" to activities when you have more energy, and that's what exercise does to you.