Exercise can be enjoyable. Even if you are completely out of shape you can start getting your heart rate up to 120 BPM for an hour four times a week and it will be enjoyable. After a while you can increase that to a 145 BPM heart rate for 40 minutes and it will be enjoyable. One thing with aerobic exercise is overcoming boredom. I first overcame boredom by reading John Kabat-Zinn's book Wherever You Go, There You Are. Then I started running. I recently joined Life Time Fitness and I did an evaluation with a personal trainer. I thought it was strange when he referred to the five minute treadmill test as boring. I thought about how much my perspective has changed in the last couple of years.