During the school year, I try to fit a couple of workouts into my weekly schedule. Now, I’m not an exercise fanatic, by any means. I’m not hitting the gym pumping iron. It’s more like running a couple of miles with the geriatric dog, or doing a workout video (at my own pace) in the living room. My favorite is Jillian Michael’s yoga, a weird sort of cardio/yoga workout routine. A couple of years ago I expanded on that, adding Tony Horton’s P90X3...