The reason seems to be that the slamming motions on high-speed craft are very irregular. One severe impact can follow split seconds after another. Regular suspension mechanisms often do not have the capacity to handle such actions.

It has also been shown that a standing person repeatedly receives amplified impacts on the back, compared to the impacts measured from the deck. Standing up is not a safe method of reducing impacts on the body.

The human reflex-controlled muscular suspension system is active every time we run or jump. It is optimized to take up even larger accidental shocks.

All Ullman JockeySeats provide the optimal conditions for the body to react adequately by:

	Stabilizing the entire body
	Using the legs in controlling the shocks
	Supporting the optimal shape of the human spine to withstand impact
	Keeping the head in an optimal balanced position
	Keeping legs in optimal positions to take up impact
	Allowing the arms to take up energy and support the upper part of the spine
	Allowing the spine to flex gradually sideways at lateral impact thus reducing compression forces on the spine.