How:When the leg away from the wall is stationary you will bias the invertors of the ankle, muscles that pull the bottom of your foot inward. The further you step away the more these muscles are challenged.
Flat Feet? This is a great way to target the Tibialis Posterior, which is a muscles that helps support the arch of the foot. When there is a dysfunction in this tissue- it often manifests with pain on the inside of your lower leg and can be the culprit In shin splits. Posterior Tibialis Tendon Dysfunction is also one of the leading causes of acquired flatfoot deformity.
Feel: You will feel the calf muscles work, primarily the muscles on the outer portion of the calf.