Slot your foot (big toe up, pinky toe down) into the crack up to the arch of your foot, keeping your knee out to the side.

The unshod runners' style causes more flex in the foot's springlike arch ankle and knee and engages more foot and calf muscles blunting the impact on the body and making for a more comfortable "ride."

You may need orthotics to help your feet work normally during physical activity, especially if you are active and have knee pain or pain in the arch or heel area of your foot.