When I was a child, I wanted to be an actor, but I had really bad buckteeth. I didn't want to get braces, but my mom said I couldn't be an actor if I didn't get the braces. So, I got the braces.
If I'm working on a film, I'll do sit-ups for before I shoot. Like, 100 in the morning or something.
When we were doing 'Freaks and Geeks', I didn't quite understand how movies and TV worked, and I would improvise even if the camera wasn't on me. I thought I was helping the other actors by keeping them on their toes, but nobody appreciated it when I would trip them up. So I was improvising a little bit back then, but not in a productive way.