>>144684
Eh I don't really do it but it covers every base pretty much. Good foundation. I just put it together so that there's equal representation for OP
From what I've seen and experienced: For L-Sit, make sure your shoulders are pushed down and forward (no shoulders by your ears, keep them down). Try to lean into the sit by raising your legs and pushing your hips past your arms (try to). Don't start out good then slowly decline into a lazy kindergarten L-Sit unless you plan on doing really high volume. Try to keep it in best form, cheat a little, then do a last ditch maximum effort in the last 3 seconds of the hold. Besides individual holds, do a good amount of volume, 5 holds a day at least. If you're doing other stuff that requires the shoulders, hip flexors, serratus and abs then 5 is perfect. If you're not, 10 is good. If you're not suffering (or high from the pump or something) a bit that DAY (rather than hour) then you'll only make slow progress. Do some recovery and stretching after especially if you're going to workout the next day or do absolutely nothing until your next workout.
Making progress is pretty universal across all exercises. You learn the principles behind it and you're 80% there. Develop your capacity to do work day in and day out, check how much effort you're putting into making each rep high quality and intensity, use good form, and you'll progress.