i am not sure why but I have never had to motivate myself to invest in my own health. Daily exercise is never an issue. It is simply a habit. It is part and parcel to who I am. I could channel my father and get some negative talk (So you had a heart transplant. BFD. Get your a** up and get busy.) I do agree that variety helps. I do crunches, stretching, a little weight lifting, more resistance bands, walking, biking, and an elliptical trainer. I do track my steps and calories and watch my long term trends in a little self competition.