Let's talk hanging leg raises. One of the biggest mistakes that I see here is that when people get set up for their hanging leg raise. What the motion that they go through is there, they're just lifting their legs up like this. What's happening at this point is it's just your hip flexors that are lifting up your legs, and your core is doing very little work. Where your core becomes a gauge is more through the pelvic tilt and the curl of your legs up towards your chest. Try this out, next time workout.