I've taken to printing out something I was going to read anyway (like lecture notes) and reading it on the treadmill while brisk walking at 4.5 mph or so. Going

I've taken to printing out something I was going to read anyway (like lecture notes) and reading it on the treadmill while brisk walking at 4.5 mph or so. Going to the gym isn't time consuming anymore - I just get two things done instead of one. Obviously that wouldn't work for real running or weightlifting, but it's better than no exercise (which is what I was doing).