Join Date: Jun 2009
Bikes: Reynolds 531P road bike, Rocky Mountain Metropolis, Rocky Mountain Sherpa 10, Look 566
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I find fins most useful for swimming really slowly, oddly enough. If I want to swim in "slow motion" to get some aspect of technique, such as timing, the fins let me do that. Then I gradually speed up and shed them altogether for swimming.
Fins help with flexibility, but I'll never have the ankles of a life-long swimmer - even after 12 years of swimming and using fins, mine are still stiff. Since even elite swimmers with extreme flexibility only get 20% of their forward propulsion from kicking, I don't worry much about kicking. A six-beat kick just slows me down.