[fnrslvr]

I followed Start Bodyweight for a while, seemed pretty good. The emphasis on being able to manipulate one's own bodyweight appealed to me, and end goals of the progressions like one-armed pushups/chinups/etc are pretty cool. Minimal equipment required, mostly just access to a bar for pullups/chinups and somewhere to do inverted rows and dips, though it's usually advised that you add deadlifts. 30mins 3 days per week is about what's required.

The Bodyweight Fitness subreddit provides similar routines, as well.

http://www.startbodyweight.com/

https://www.reddit.com/r/bodyweightfitness/

There are also a lot of resources on youtube if you want video demonstrations/walkthroughs. Calimove was pretty useful for me.

https://www.youtube.com/@calimove

That said, I was probably in the best shape of my life back when I used to do indoor rock climbing three days a week. It incorporates a satisfying combination of technique/problem-solving and physical strength/endurance.