If you move something 10 pounds through space and then stop suddenly, there's a little overshoot. When you transfer weight from one leg to another, there's a certain way that it happens.
Without naming names, I think other movies look more realistic but they feel less real.
That's not the part of the story that I'm interested in, anyway. The part that I'm interested in is all the personal stuff. I tried to base the powers on family archetypes.
You have to be emotionally attached to what you are doing.