Don't be surprised. Not too many people can. The more we bend our knees the weaker our legs are. The CADS lifting force works the opposite way. The greater the flexure of the knee, the greater elongation of the elastic band and therefore the greater the lift.
Aerodynamic stance is very important.
A full tuck position while traveling over rough terrain at high speed will quickly reduce a skier's strength reserves. CADS enables a downhiller to spend more of the course in a tuck. Because his upper body is supported by stretched rubber bands, his physical strain is sharply reduced. He does not have to preserve his strength. He can therefore concentrate more on refining and maintaining the shape of minimum wind resistance memorized from wind tunnel exercises.