 Locomotor Training Intervention. Individuals with SCI will participate in 80 sessions of weight bearing step-training n10 for approx 16 - 20 weeks 60-90 minsession, 3-5 sessionswk during which the individuals will be placed on the treadmill in an upright position suspended by an overhead pulley in a harness. During stepping using BWST manual assistance the maximum load will be used that avoids knee-buckling trunk collapse. A trainer positioned behind the research participant will aid in pelvis trunk stabilization, as well as weight shifting hip rotation, trainers positioned at each limb will provide manual assistance using a customized technique that facilitates knee extension during stance by manually stimulating the patellar Achilles tendons knee flexion toe clearance during swing by manually stimulating the hamstrings tibialis anterior tendons. Trainers provide assistance only when needed. Individuals will step at a normal walking speed for their height age 0.89 ms - 1.34 ms at the maximum body weight allowed with minimal force needed by the trainers to assist during stance. BWS will be continuously reduced over the course of the 80 sessions as the individuals increase their ability to bear weight on the legs during stepping. 