My dad used to always bug me about my cycling: 25 miles, (one way) to my coaching job, then another 5 miles to my desk job. Work 8 hours, then 30 miles home. Sometimes I would even stop at the rowing club for a 45 minute rowing workout.
Even though I was in the best shape of my life, it really bothered him.
I alwyas use to reply "if it doesn't bother me, why should it bother you"
I could never understand why it bothered him so much