How do you stay (somewhat) healthy?
mark_h: Keeping it simple.  The two main principles:
1.) you can't out-run a bad diet;
2.) effort trumps everything else.Eat cleanly ("if it doesn't go off, don't eat it", etc).Exercise: a mix of weights and conditioning; I favour short, high-intensity workouts for conditioning, with steady-state aerobic running occasionally for variety.  Others have mentioned crossfit which is certainly good -- I've been basing my workouts around http://www.rosstraining.com for a while, with great results.  Jim Wendler's 5/3/1 routine is great on the weights side of things, and you can find most of the info on it in this interview: http://www.tmuscle.com/free_online_article/sports_body_train...Routines help; as a hacker it's likely you have at least mild obsessive-compulsive tendencies (maybe that's just me, but it seems common in hacker friends too).  Being obsessive means that you're less likely to skip a workout, eat badly, go to bed at irregular hours, etc.+1 for the mental relaxation (including rest/deload days if you're exercising seriously) mentioned by others as well.