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Biofuse Fitness Fins are short, dual intensity fins with stiff blades which create maximum resistance in the water. Strengthen leg muscles - added resistance increases the workload on your leg muscles which increases strength and endurance. Increase workout speed - Biofuse Fitness Fins add extra propulsion to the stroke, which increases speed with minimum effort leaving you free to ingrain correct technique. Develop ankle mobility - The increased surface created by the Biofuse Fitness Fins forces ankle extension during kicking, which makes the kick more propulsive and efficient.