Honestly, I hate exercise for the sake of exercise. I can't motivate myself to do it. But I discovered that I love running! After about a year of doing it, I'm up to running about 25 miles a week and training for a half-marathon, so I'm definitely getting plenty of "exercise," but it's the form of a sport I enjoy, not saying to myself, "Well, I guess it's time to go exercise now."
For strength training, my motivation is that it increases my running performance...and I like how I look when I flex. :) But again, still not exercise just because I should exercise.
So basically, I'm agreeing with others that once you find an activity you enjoy, you don't have to think of it as exercise and it will be easier to feel motivated to do it.
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