One small habit can reshape how you see yourself. A teammate started taking cold showers and began identifying as someone who does hard things, which spread to other areas of his life. Peter Attia calls exercise a keystone habit for the same reason: once you see yourself as disciplined, other healthy choices follow.
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In order to change our identity, often all we need to do is commit to doing one small thing. One of my friends and team members, Tin Tin, started doing cold showers recently, and he's into this sort of stuff. So he was like, weirdly, when I start my day with a cold shower, it helps embody the identity that I am the sort of person who does hard things, and that bleeds into other areas of your life. And some people, you know, make that point of like, oh, if you want to get in shape, it's not about exercise, it's about the diet. But as Peter Attia would say, actually, the exercise is the keystone habit that like everything else flows from that. Because if you are the sort of person that exercises every day, you are also the sort of person that starts doing these other healthy habits. Just to stay consistent with that identity.