It seems those that benefit most from exercise from a productivity standpoint are those like myself. Exercise has been very helpful fighting depression, and thus, my productivity. I could imagine that those without depression would not get the mental benefit that easily overrides the effort of exercise.
I can actually sympathize with this. It was the reason I originally began exercising, and I know it helped with that. I don't know how much. I got more committed to meditating over the years and found the returns on meditating to be undeniable. I figure there are many sources and types of depression, and I think lower productivity undermined some of my efforts to fight it.
