If I'm riding my bike I just replay the same scenarios over and over in my head, like I haven't had a new mental adventure since high school. So that's what I like about books on tape, so my mind can't wander anywhere. ↗
I'm not a huge gym person, so I try to stay away from the gym. But I love to run on the beach or go for a walk. It's better than riding a stationary bike. ↗