Patients seated on the bike have electrodes attached to the surface of their legs by their therapist. The system sends computer-generated, low-level electrical impulses to patients’ legs, which cause coordinated contractions of the quadriceps, hamstrings and gluteal muscles. Sensors provide constant feedback to a computer, which controls the sequence of muscle contractions as well as the resistance to pedaling. The result is smooth and natural pedaling with patients’ leg muscles providing the power to move the bike.