I’ve done the whole “stop working out for many months, then start again” thing enough times now that I ought to know the ropes. It is never as bad working out as I think it might be, and it always hurts more the next day than I remembered.
On the plus side, tonight I biked & ran on some kind of elliptical machine for 35 minutes straight at my “target heart rate”, which I think is longer than I’ve done in several years. Yes, that’s sad. I’m working on it.