Describe a healthy habit you have

The habit I'd pick is swimming, which I've been doing three mornings a week for about four years now. It started almost by accident — a doctor mentioned in passing that my shoulders and lower back were tense from sitting at a desk all day, and a colleague dragged me to the pool near our office rather than actually recommending it seriously. I hated the first few sessions, if I'm honest; getting up at half past five felt borderline masochistic. But I kept it up mainly by removing the decision from the equation — my bag is packed the night before, and I don't allow myself to negotiate with the alarm once it goes off, because if I start weighing it up I'll always choose the extra sleep. What's kept me going long-term, though, isn't discipline so much as how different the rest of the day feels afterwards. There's a kind of mental clarity for the first couple of hours at work that I just don't get any other way, and my lower back pain, which used to flare up constantly, has more or less disappeared. It's also become oddly social — the same small group of regulars shows up at that hour, and we nod at each other without really talking, which I find strangely comforting. I wouldn't say I enjoy the actual swimming that much, even now, but I've clearly come to depend on what it does for me.