CrossFit Lindy: L-Pull Ups

[Xulu12]

I have the opposite problem then piesmusher i can do L-pull ups but not muscle ups :'(

[piesmusher]

I can do a few muscle ups but i don;t have the core strength to even do a few of these L (legs straight out) pullups,, How would you suggest I start strengthening my core? thanks

[sabertoothtimmy]

@piesmusher Do some Overhead Squats, Front Squats, GHD Back Extensions and GHD Sit Ups!  Then just practice the "L-Sit" on some parrellete bars