I do not have access to a pair of stall bars or a partner to spot me when I do leg lifts on a pullup bar. I know this makes the exercise easier because with no back support, you are liable to engage other muscles to make the exercise easier.
Would doing leg lifts in a hollow body position on the floor be a good substitute for the difficulty the stall bar variation creates, or at least a better alternative to doing them on a pullup bar with no back support?