[dewote]

Do you know of any recommended stretching routines?

[vl]

I just do stretches for the muscles I'm training.

This is good book:

https://www.amazon.com/Stretching-Pocket-Book-Bob-Anderson/d...

This strap is really helpful:

https://www.amazon.com/gp/product/B00065X222/

[jplayer01]

Agile 8 and Limber 11 are the most common ones I've seen. The r/bodyweightfitness subreddit also has a decent routine.