CorMax Grenades, Torpedoes, AQA Balls, Commander and The Beast have the huge advantage of the unstable water flowing action. When you are using the CorMax range, the destabilising forces come from top down, not bottom up.
Since most sports/activities are done with your feet on a stable surface, the CorMax destabilising exercises emulate the real conditions far better than those done with an unstable base.
This is vastly more functional and specific to most sport situations where the athlete has to act in a highly challenging environment with impact or contests from many directions.
Excellent applications for the CorMax range can be found in sports such as rugby, football, tennis, golf, canoeing, judo and gymnastics as you mimic many of the movements required in these sports.