 wish I had worked out more. Now keep in mind I worked out pretty much five out of seven days every single day for the first two to three years of medical school. I was pretty consistent, but now that I realize how fit I should be after doing that much I wish I had worked out more purposefully. I wish I had worked out all of the different parts of what consider to be overall fitness. That includes flexibility, explosiveness, endurance. I didn't get into running marathons until I was a resident, but if I had focused on my overall fitness in all different aspects, not just how much I could squat or deadlift, I think I'd be a much healthier version of myself now because I would have been able to use that as a foundation.