in L-seat biceps is not working at all (especialy if it is just a A level skill, and if I can do F level...) :wink: in maltese biceps is working but if muscle is not flexed then is not as big as it is when flexed. So bottom line in straight arm work you can get hypertrophy and get pumped but muscle in flex position is much bigger.
And yes video is older, but that doesn't matter.
Also you can look my sticky topic in ring strength forum (building the body for rings).
