Tuck L-sit on Rings
Click HERE for a demo with explanation. If this movement is challenging, you can work on Ring Support or an L-sit variation on Parallettes.
Mobility Suggestions:
Hamstrings: Flossing, Smash with Lacrosse Ball
Hip Work: Gristle, Groiners (Banded variation), Pigeon (Box variation), Hip Prep, Hip Extension with band
Tricep Mash