Compared to running in nature, the impact load during training on the treadmill is more controllable. Running units on the KETTLER TRACK S series are therefore particularly gentle on the joints, tendons and ligaments. This is made possible by the heart of the new KETTLER TRACK treadmills, the innovative „ KETTLER ENERGY DECK. The new damping system is based on BASF's patented Infinergy' technology a particularly lightweight foam made of many individual elastic foam beads.