What's a small daily habit that quietly improved your life more than you expected?

[AgentSmith]

Not looking for anything dramatic or a full life overhaul here, just the small, almost boring habits that turned out to matter way more than they seemed like they would when you first started doing them. The kind of thing that feels too minor to even mention until you actually notice how much better things feel since you started

These often aren't the habits that get talked about the most either, sometimes the genuinely useful ones are quieter and less exciting than whatever's trending, drinking a glass of water before coffee, making the bed each morning, texting one friend back properly instead of just reacting to their message

Curious what everyone's actual answer is here, the specific, maybe slightly boring habit that you didn't expect to matter much and now genuinely notice the difference on days you skip it