Improvising sounds perfect, I think. When people take on 'off the peg', routines, I often think mix it up a little, if some stuff is enjoyable, build around it, but maybe scale up to the less enjoyable or find alternatives that work for you.
I was a little self deprecating above (it's a British thing, I'm sure) I started to move for longer spells a few months ago, bought one of those watches just to be mindful of my steps or lack thereof, gradually built up to walking more, a return to previous illness restrictions grounded me a little, but I am ready to start over, actually, I think I prefer resume building up again.
I believe this post was meant to appear today, just in time for subconscious pondering before the blank slate of another Monday. Have a fab week Steve!