Physical activity is so important I'm surprised companies generally don't actively encourage employees to exercise. Instead they stock the kitchens with sodas and junk food. I wouldn't make exercise mandatory but I'd try to encourage everyone to a 40 minute workout in the middle of the day a few times a week. Sure, not all companies are equipped for that but many are. The thing is most people are too tired before or after work and during the weekends. If we can get them to move a bit during the day it will work. And people will be healthier, less burned out and more productive.