 Participants will cycle for 16 minutes for the training task, plus 4 minutes before and after the training. Reflexes will be measured with nerve conduction studies and somatosensory evoked potential SSEP recordings before and after training. Nerve conduction studies measure the speed with which nerves conduct electrical impulses and the strength of the connection between the nerve and the muscle. For these studies, a probe is placed on the skin over the calf muscles and the knee to deliver a small electrical stimulus, and wires are taped to the skin to record the impulses. SSEP recordings, which measure of the excitability of the brain to sensory stimuli, are collected from electrodes placed on the scalp. 