The comments seem to largely reflect "boring stuff that everyone already knows", like exercise. And as annoying as it is, my answer is the same. The habits that

The comments seem to largely reflect "boring stuff that everyone already knows", like exercise. And as annoying as it is, my answer is the same. The habits that have improved my life the most are the normal things everyone keeps telling us about: going to the gym, striving to keep a relatively healthy diet, getting enough sleep. I was fortunate in that working out for me has a more jarring/obvious effect than it does for some people that really kicks my ass into gear. I have really bad knees, and the only thing I've found that consistently allows me to live without knee pain is strengthening my legs[0]. If I stop working out and let my quads get weak, there is a gradual but noticeable decline in my mobility. I can't tie my shoes or walk down stairs without pain, wake up at night with hurting knees, etc. So for me, it's either get to the gym (or run, but I prefer the gym) or live in pain. So I think that's the most noticeable habit that has improved my life. [0] I wrote about my experience with this here: https://liza.io/how-leg-extensions-saved-my-knees-quick-knock-all-the-wood/ https://liza.io/how-leg-extensions-saved-my-knees-quick-knoc...