They also determined how much energy they used to walk for five minutes on a treadmill, in both high heels and flat shoes. People who use less energy than others are more efficient walkers.

The results raise the unexpected possibility that high heels might serve “as ... determined how much energy they used to walk for five minutes on a treadmill, in both flat Chuck Taylors and ...

This heel-to-toe motion repeats and normal walking occurs. Reverse walking involves an opposite gait process. Your leg swings through the air and reaches backward with a bent knee.

The same Indian Journal of Physiotherapy study explains this: walking backwards is unique because of 'the toe-heel' movement ... backwards be done on a treadmill or outside?