Your heart has worked every shift since before you were born and never asked for a day off.

Your body has been running a continuous operation you have never once had to supervise. No decision of yours keeps it going, no gratitude is required for it to continue, and it started before you were aware of anything at all. That reliability is why it is so easy to ignore, and also why it deserves better than being noticed only when something hurts.

Do one thing for it this week that counts as care rather than correction. Sleep the full night, walk somewhere far, eat an actual meal sitting down. Treat it as maintenance on something that has never taken a day off.