^^^ Being a man of Science, I tried an experiment when that thing came out. I had a yuge stack of phone books, and piled them against my toilet. I soon realized I could achieve the same schpincter /leg angle by, not raising my legs, but by simply bending my torso down to my legs.
Wow! Super-easy, and thorough poop! Sorry that this is so graphic, but it worked explosively, with no phone books or plastic stools (heh) required. I also noted that my bathroom floor needed cleaning, and toenails needed clipping, so there's that.