@denise123 Most people plateau in L-sits bc tight and poor core (esp compression) strength. It’s the basically same training whether you are starting to be straight legged or going for the manna (just more intense):
Make sure you warm up and stretch both before and after bodyweight exercises. As part of warm up do light compression moves then standing fold compressions or palms to the ground for time- everyday for the hams and stretch those flexors dynamically and statically.
Always remember to do dynamic before static, full range of motion with good posture, breathe correctly etc bc you want to do any exercise perfectly.
Dynamic: do some toe to bar touches w straight legs with different grips. Don’t use momentum or allow back to swing to compensate. (Ideally do this on stall bars from horizontal.) Do flutters while in a L-sit position.
Static: Do L-sits hanging, on parallel/dip stands, on the ground and rings to increase wrist strength.
Do basic core work, straight arm triceps work daily.
Tips: Make sure you are “tight” everywhere. Eg point your toes (might help to take off shoes). Lower weight eg no shoes will make it easier.