The dog, Duke, would either stand still as a post while Hooper was on the ground, to urge him to get up and continue trying. Or he would do something completely different - he would walk faster and faster, which in turn made Hooper walk faster than he used to, which eventually affected his endurance and stability positively.
Aimee Mullins has difficulty walking across the floor because she is walking on five-inch heels but doesn't have any ankles due to her legs being amputated at an early age.
