I used to be about 20 lbs overweight for my size, and over about a 3 year period, I gradually got the weight down through consistent exercise: Goin to the track, doing intervals, long-distance running, weightlifting. As a result, I began to feel a lot better not just because I was losing weight and getting in shape, but because I was also gaining self-confidence. I always feel a lot better when I'm on a workout schedule. And If I've missed a workout or two because of laziness or because I'm too busy, I feel down. I think it just has a lot to do with being proud of myself for working hard at something. Anyway, not sure where I'm going with this, but to say that for me it seems to be more of a self-confidence thing than a more energy thing.

- trs