I would like to know the muscles that are involved while doing a V sit Vs doing L sit. Is one a progression over the other?
Trying V sit for just 15 seconds cause my quads to ache. Is that a weakness exposed?
Thanks.
The L-sit is the progression towards V-sit, finishing with Manna, which is an advanced-level gymnastics skill (in this chart of exercises taken from Overcoming Gravity, there are only a few skills which are rated harder than the Manna -- L-sit is a "level 3" skill, V-sit is 6 and Manna is a whooping 13).
Leg cramps are normal during L-sit/V-sit work, they should get better with time. It's not a weakness.