I swim twice a week, wich i feel really improved my posture, practice aikido 3 times a week, wich REALLY! improved my patience, and run 3 to 4 times a week. I also attend occasionally to other martial arts classes like jiujitsu and capoeira, but that's mostly for fun.
When i'm not able to practice sports for some reason, it doesn't take me long to feel way less energetic, so i try to at least run, even if just a few miles.
The down side is i don't get much time to sleep, we have 12 hour days at work, everyday.
Food wise i always carry fruit, oatmeal cookies, and a variety of Teas with me.
(its pretty acceptable to eat during wardrobe changes and such, as long as not directly on set)
At lunch it really depends, i try to eat healthy but in some locations Pizza and pasta are waaay to good to skip on.