Just a quick tip I discovered during my last workout.
I workout in the morning, first thing, and I forgot to change out of my pyjamas. Anyway, my pyjama pants have tie up straps that I never do up. As I do push ups and such, they just dangle.
As I did my planche leans in warm up, I noticed how the strings dangled right between my hands. Instantly I realized that was because my hips were in line with my hands. Normally I have to check a mirror or film myself to make sure my lean is adequate. Now I don't have to. If you have similar straps or strings or perhaps a loose belt, you can instantly check to see if you have enough lean. Also, you instantly know if you start sacrificing lean as the set gets longer.
If nothing else, it gives you permission to workout in your pyjamas.
