You are talking behavior. I think there is a conception by some people that exercise increases appetite. Hence people are eating more not as a reward but because of the exercise itself physically making them hungrier. I haven't found this.
Psychology wise though, I don't want to 'blow it'. Forget about 'rewarding'. Plus food is no longer a reward for me.
Restart: May 1, 2013 at 285. HW 340