This stability comes with a downside, though. They are definitely harder surfaces to play on (evidenced by Clegg Hammer readings) and some theorise that there is also a risk of boots getting stuck more easily in the turf and providing more rotational force through the lower limb. Harder pitch surfaces that deliver back more reactive energy to the players. Rather than the feeling of deadening legs that players have on softer or boggy surfaces, they are allowed to reach their peak velocities quicker. It is the same principle that applies in the 100m races at major championships, where harder tracks are described as fast tracks for the sprinters. Players will feel the shock going through their bodies and they will feel it more in their joints (bones) and tendons.