Recently, I was asked that question and my answer is, “A good exercise is anything that provides you with a challenge, that you enjoy doing, and that you want to do again.” I know I’ve said it before, but I’ll say it again, don’t try to plan your exercise schedule based on someone else’s likes and dislikes. I like to bike ride, “Bob” likes jogging, and “Mary” prefers skating. Which one of us is doing the “best” exercise? I think that as long as a person does what they like and they feel challenged, then everyone’s a winner in my scenario. Personally, you couldn’t pay me enough to skate, so that is NOT a good option for me, lol. However, I really enjoy a good bike ride, so as long as I stick with what I like, then the odds are that I will incorporate that exercise into my personal schedule.