My problem with deliberate exercise is that it doesn't feel purposeful (vague notions of improved health notwithstanding). Picking up a chunk of iron just to put it back down again or stomping on a moving platform just to remain in the same place feels about as useful as typing out a bunch of boilerplate code just to delete it shortly afterwards. I might change this attitude should I find more interesting activities.…
And if you are not sweating, it is not exercise. Make as many excuses as you want, lots of people do, but you will feel better if you do actually exercise.