Crazy!!! Obviously this move is quite difficult, the machine found an article on progressions. Check it out below. Obviously you must be able to do an L-sit in support for the L-sit walks and for these progressions (unless specified) I'll assume you can. First off work support L's on floor or p-bars (if you can't then use the same progression as in coach sommer's hanging leg lift article) then move to rings (this will help extremely with L-walking and can be used even if your more advanced). Next is dynamic support work, if you are training static support L's (straight or tucked) and aren't very proficient at them then start with penguin walks (walking along p-bars or something you can walk along in a regular support position). If your proficient at tuck L's or are working on straight L's you should work on penguin walks in tuck L. Eventually you should be able to perform in a straight leg L. These progressions are for people who are beginners (strength wise) who particularly want (to work) this conditioning skill . Now some variations. The first is V-sit walking, same thing just in V rather than L, work V-sits on rings statics and movements (some [little] dipping motion and just moving the rings around a little, all within your limits) then take it to floor or p-bars, strive to keep your hips still as possible (not swinging into manna). The next is manna walking (this is just an idea, I've never seen anyone do it or heard of anyone doing it, it would be for advanced athletes), I won't go into how to work up to a manna here (mainly because I'm not that knowledgeable on it) with this it would/will not be possible to keep perfect form just make sure there's minimal swinging motion (if wanting to try these and your unable to perform static manna's but can do V's swing into manna as best as possible and hold as best as possible). The final two are weighted and/or object carrying L or V-sit walking, this can be done in any number of ways, some for actually weighing you down others for keeping your form or balance etc. firstly the very obvious ankle weights (can be any weight carried between your ankles) I won't spend any time explaining this one. I like carrying medicine balls on top of my legs (they weigh you down and force you to keep steady) or it can be any type of ball (basketball, soccer, etc) these can be placed anywhere along your legs for diiferent challenges. One fun and challenging thing to carry is a cup of water (wise to do this one outside) this one will really stop swinging. There are also lots of games you can play with this (good if your a coach or if you train with a kid/ just playing with them) like carrying objects (soft toys or something light and simple to carry) from one point to another with various rules (most in set time period, most without touching floor [apart from hands], most water still in container) or races. Like I said before the progression presented here are for people who are starting strength training and want to be able to train this from the start whereas for more advanced trainees (not advanced athletes) who can do support L-sits and such this "skill" should come quit quickly just practice it a bit.