RecruitingClinical trialElectrical Stimulation Exercise for Individuals With Lower Limb ParalysisThe purpose of this research study is to evaluate the effectiveness of an exercise training intervention (24-36 sessions) to improve muscle strength and endurance in the lower limbs of individuals with paralysis. Specifically, surface electrical stimulation or previously implanted stimulator will be used to stimulate the muscles during various forms of exercise training with the primary focus on improving overall endurance and maximal power output. For this study, peripheral stimulating electrodes will send electrical signals to the muscles enabling the production of coordinated movements for exercise such as cycling or rowing.