Heavy lifting is the only thing that’s stuck for the way my brain works. I used a program called 5x5:

• only 5 different lifts to learn, each full body so there’s no fiddly minmaxing
• more or less timeboxed. 5 sets of 5 reps 3 times with about a minute between each rep and set. To improve, you add more weight, not spend more time
• consistent, once you get the routine down, and you know roughly how long it’ll take, you can just let your body take over, coast on muscle memory and motor neurons, zone back in in an hour when you’re done
• numeric satisfaction as your weights increase in fixed increments.
• immediate gratification because functional strength is neat and comes on surprisingly fast

Downside: So hungry, all the time.

It’s been a few years since I’ve been active. I used to live in an apartment directly above a gym. Now I live in the boonies and need to convert my carport into a garage before I can buy a weight set.