I've been working out, I'm huge

Arnold Schwarzenegger flexes an arm while in his prime.

After he swims, the Complete and Total Loser goes to the weight room at the college sports facility he visits three times a week and lifts weights a little. He's lifted weights off and on since he was in high school, but fell away from it for years until now.
The Loser is so dumb that he recently thought he'd gained muscle because when he bends his arms he feels a tightness he didn't feel two months ago. He realized, finally, that the tightness had nothing to do with increased muscle mass in his sagging arms but was because he's wearing two shirts instead of one to deal with the colder weather. The Loser is such an idiot sometimes. Not sometimes. Always.