for h/p/cosmos running machines with deck size 170-190/65.
The original rubber elements for shock absorption on the running deck are replaced by steel elements. This is to make the deck much harder and the subjects has lower energy consumption. But the load and shock on the subject also is increased and may cause health problems and injuries similar to running on hard asphalt on the street. The only remaining shock absorption is the running shoe, the running belt surface and the running machine frame with elevation element.