Speedo Biofuse Flexible Comfort Grey Pink Fitness FinFitness 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 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