What? I thought leg lifts were just holding your legs an inch or two from the ground, straight, and nothing else (man that burns after a minute...); perpindicular to the ground is just resting :| . What are you talking about in the bolded part? Sorry for not being a training expert if I don't get it :| . There are a few leg lifts that I know of, one of them is you lift your legs 2-3 inches off the ground(max) then lift them 6 inches higher, then lower them into the original position of 2-3 inches off the ground. The other one that I've done you lift your legs off the ground 2-3 inches, spread your legs apart, bring them together, put them back on the ground then repeat.