A series of experiments including torque output tests, transparency tests, cardiopulmonary exercise tests and surface electromyography tests with five healthy subjects (height, 1.76 ± 0.05 m; weight, 72.5 ± 7.26 kg; age, 27.2 ± 2.86 years; all male) to validate the effectiveness of the SPURS. All participants provided written informed consent to participate in the study.