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Spinal cord injury (SCI) disrupts many aspects of life, including the loss of volitional movement and involuntary control of bodily functions; both crucial functional recovery priorities for this population. Mobility impairments and secondary complications limit an individual's ability to exercise, a behavior known to have wide-ranging functional and health benefits. This trial will investigate whether activity-based therapy (ABT), using a robotic exoskeleton, can change the strength of signals from the brain that control volitional movement, leading to improvements in standing and seated balance as well as other important involuntary bodily (i.e. cardiovascular, urinary tract, bowel and sexual) functions. The investigators aim to determine whether these improvements can be augmented with the addition of non-invasive transcutaneous spinal cord stimulation (TCSCS). This therapy has been shown to re-awaken dormant spinal circuits. In this randomized controlled trial, TCSCS with ABT, using robotic-assisted gait training (three sessions/week for twelve weeks), will be compared to ABT+SHAM in individuals with chronic motor-complete spinal cord injury (SCI). Those in the ABT+SHAM group will be given the option to complete an ABT+TCSCS open-label follow-up. Before and after training, the following outcomes will be assessed by validated methods: corticospinal excitability, motor function, and seated and standing balance (Hypothesis 1 - Motor Function); severity and frequency of blood pressure instability, urinary tract, bowel, and sexual dysfunctions (Hypothesis 2 - Autonomic Functions); and general health (Hypothesis 3 - Quality of Life). This collaborative project is between consumers with SCI and clinicians/scientists with expertise in SCI care (kinesiologists, physiotherapists, physiatrists, sexual health clinicians). Compared to ABT alone, the investigators anticipate that ABT+TCSCS will result in superior improvements in motor and autonomic functions in individuals with SCI.