there should be no question about the ability of the fins to perform the kicks, the problem is the instructor. Learning the kicks that they require takes time, learning to use ForceFins takes time, combining learning the new fins and trying to learn the new kicks at the same time will prove very difficult. Then you combine that with the fact that the instructors have no idea how to teach the kicks using fins that they have absolutely no understanding of, well you can guess where that will lead.