Ah. You're assuming that the original poster's dislike of exercise is the same as your dislike of the pain of exercise. They're not necessarily the same.

As it happens, I dislike exercise as well, and it's not because it hurts. (As you point out, it doesn't have to hurt.) It's because it's unpleasant in a lot of ways, it's boring (no matter what exercise I try), and I don't get anything else out of it. I don't enjoy being out in nature, I don't get a feeling of accomplishment from moving around, I don't feel better afterwards. This is true for exercise at any intensity level. As it happens, my life is active enough to keep me fit without extra exercise, but if I had to dance/run/row/lift/bike/hike/walk/roller skate/rock climb/ski/anything in order to stay healthy, I'd dislike it. That's just how it is. Some people do not like physical exercise, period.