Yeah, tell me about this one. I'm a guy who had a heart-attack, right in the middle of a period of time when we seemed to be getting some momentum going with the startup. I knew I was being silly putting off working out and being active and eating healthy, but I figured "things will level off soon and I'll get back to that stuff". Ummm.. no. Didn't work out that way. And when you're on the back of an ambulance being rushed to the emergency room, it's a bit late to start worrying about getting fit.
Luckily for me, I survived, and I've gotten back into bike riding big time again, and now I take time out to go ride an hour or so a few days a week, work be damned. :-)
So there's at least one lesson I learned and benefited from, but what a horrible way to do it. If anything I say on HN can help influence anybody else, let it be this.... DO NOT DO WHAT I DID. Take your health seriously, and do it starting NOW, regardless of how old you are. Remember, the artery damage that leads to heart-disease (and ultimately, heart attacks) begins very young... in some cases as early as your teen years (maybe earlier in some extreme cases). And definitely by your twenties, if you aren't eating right, watching your lipid profile, staying active, etc., you are setting yourself up for problems later.