This part of ISO 20957 specifies safety requirements for stepper, stairclimber and climber machines (hereafter called training equipment) performed from either a standing or sitting position in addition to the general safety requirements of ISO 20957-1 and should be read in conjunction with it. This part of ISO 20957 is applicable to stationary training equipment type stepper, stairclimber and climber training equipment, within classes S and H. Additional requirements are provided for accuracy class A.