I am sure what Meessier means is that Force Fins work best if you alter the shape of the kick from what you would use for jets, or altered from freedive fins ( which are the most extreme hip and whole leg), to being much more from the knee..in other words, they concentrate the muscle power of your quadriceps. The Hockeys and Excellerators allow power from the leg biceps/hamstrings as well...I cant say about the Originals, as I have never used them, and they would be much too small a gear for me. If you are a cyclist, or even a runner, or a swimmer, the muscles that are most developed are the ones the Force fin uses.
With your pro force fins, work on power from the knee, and higher cadence for more speed. This is actually what the fin actually "causes" you to do....it really gives you the shape of the kick....You don't use a huge amplitude, low frequency kick like freedive fins...it is a medium to less amplitude, and cadence will set up speed.
Tangentally.....there is an advantage to the muscle concentration that Bob Evans has built into the Force Fins ( and optimal kicking for them)...most people, most divers, have not developed their hip flexors and extensors, with all that much strength or endurance, and most have done little for their hamstrings or calves. Force Fins let you use what you have trained the most, and use it well.
In my case, as a long time competitive cyclist, all my leg muscles are trained, so a big Freedive fin like the DiveR's appeal to me...However....If I do a fast 40 mile bike ride in the morning, and then want to scuba dive in the afternoon, my hip muscles will be trashed from the bike ride, and the freedive fins will overwork them on an afternoon dive...overwork in a bad way.
With the Force fins on for the afternoon dive, my quadriceps and leg biceps are still able to handle many hours of this style of kicking, with what is actually a refreshing effect....like enhancing recovery from the hard bike ride. I think this relates to the person that does not train on bike or run or swim, in that they will find they will tire their hips quickly with many traditional fins, and they won't have the range in motion in their ankle/calf to allow long duration / high output use of traditional fins, without cramping--with the Force Fins, they don't fatigue, and they can use all the strength they have optimally.
And the Force Fins are RADICALLY better than any split fin on the market. The difference is so extreme, it should be an embarrassment to every magazine that ever did a winning review on split fins.
