I personally strongly believe in the goodness of regular strenuous exercise over eating well and all that good stuff, although the latter cannot hurt, of course.
The reason is, I used to be on the beach circuit, live in cars, eats hamburgers and beer, never sleep and so on. But me and me mates we was in shape year around, and never got sick.
As soon as we'd settle and started getting into good habits - regular married life, eating well, vitamins, good sleeping patterns, using utensils, that sort of stuff, but no regular sport, then we all started getting sick. Strep throats, ear infections, flu, in-grown toe nails, and so on. Appeared just about overnight, with seemingly no amount of good habits and good feeding working - only antibiotics.
I would even swear those (very few) who get back into the fold of being active, usually after a divorce, started having a better health in spite of returning to bad habits.
Anyways, that's me. I convinced the missus to let me be long time ago. We still have to use utensils when there are guests in the house, that was the main concession...