I am a fan of these movements SL and do them.
I reckon I do them more slowly which is harder, but I'm a wuss in one respect in that I use lifting hooks.
Consider this this "quatro set"
(1) windshield wipers to death; immediately followed by
(2) hanging leg raises to head; immediately followed by
(3) hanging leg raises to waist; immediately followed by
(4) hanging knee ups.
I only ever do at most 2 sets of this combo as my performance drastically deteriotates. Also part 3 of this set is somewhat pointless
I'd love to start trying proper gymnastic moves, but our gym doesn't have facilities.