Inclusion Criteria:  Participant sustained a traumatic motor iSCI (i.e. AIS C or D) at T12 or above. Injury occurred more than a year prior to study enrollment (when natural recovery has plateaued).8,9 Participant is ≥18 years old. Participant can attend three training sessions/week for six weeks (i.e. has reliable transportation). Participant is able to stand for >30 seconds without upper limb support or assistance (i.e. scores 2/4 on item two of the Berg Balance Scale, Standing Unsupported10). This criterion ensures the participant will be able to participate in upright balance exercises. Participant requires physical assistance, a gait aid or a brace to ambulate 10 meters (i.e. self-selected score of 1-19 on the Walking Index for Spinal Cord Injury (WISCI) II).  Exclusion Criteria:  Participant presents with contraindications to FES (i.e. implanted electronic device, radiation in past six months, active deep vein thrombosis, pregnancy).12 Participant presents with other conditions besides iSCI that affect balance (e.g. vestibular disorder, brain injury). Participant has a pressure injury (>grade 2) on the pelvis or trunk where the safety harness will be applied, or on the foot where the foot switch will be applied. Participant has a history of a lower limb fragility fracture.