While developing the treadmills we offered with the most comprehensive specifications, we put user friendliness and high performance forward. Whatever your needs are, your treadmill will meet them. Flex system performs a pad duty on the treadmill. When this system is compared by the surfaces without pads, the stress applied to the joints and knees reduces at the rate of about 40 % and the damage risk reduces. It also reduces the stress to the joints and wearing.