 Following the pretreatment evaluation, the patient will prepare to use the body weight supported treadmill. The patient will wear the appropriate shorts associated with the treadmill based on waist size. At this time, reflective markers will be placed on anatomical position. The marker positions will include: Tibial tuberosity, mid patella, anterior mid thigh, lateral mid thigh, lateral knee joint line, lateral malleoli, fibula head, lateral calcaneus, lateral fifth metatarsal head, lumbar spine L3 and iliac crest. These markers will later be used with the mechanics analysis software to determine running biomechanics. After the markers are in place, the patient will enter the AlterG body weight supported treadmill. After the treadmill calibrates, they will begin the first walk-jog progression. The following setting will be used for the first run based on standard protocol. 