ISO 20957-6:2005 specifies safety requirements for treadmills in addition to the general safety requirements of ISO 20957-1 and should be read in conjunction with it. ISO 20957-6:2005 is applicable to power driven and manually driven training equipment type treadmills (type 6) (hereafter referred to as treadmills) with the classes S and H and classes A, B and C regarding accuracy.