Using flippers will improve a swimmers body position and their technique. When a swimmers uses fins, they gain more speed and sit higher in the water. For poor kickers, their feet will stay higher in the water providing a more streamlined position.
Using flippers will increase your fitness and cardiovascular conditioning. Many swimmers forget to use their legs when swimming. Your largest muscles are located in your legs. By activating the large muscles in your legs, you will get greater cardiovascular benefits, burn more calories and increase fitness levels. By using fins, you increase the load on the legs and so long as you put in a solid effort, your cardiovascular system will have to work even harder, leading to greater benefits.
Using flippers will help you to increase your ankle flexibility. An increased range of motion in your ankles when you do not have fins on will provide you with improved forward propulsion. This is particularly important for those people who are not flexible because when they kick, their feet act like hooks and it feels like you are being pulled backwards. Good swimmers will plantar flex their ankles and feet, or point their toes so that there is a straight line from the knee to the toes. By wearing fins, there is an increased load on the feet from the increased surface area. This forces swimmers to extend their ankles more when kicking with fins. This leads to more flexibility in the ankles over time, and a more efficient and propulsive kick.
Using flippers will give you the feeling of swimming fast through the water. When you take your flippers off, you should be aiming to replicate this same feeling. The transfer of this feeling of swimming higher in the water and faster to doing the same when you are not wearing fins is called neuromuscular patterning. The aim is for the muscles and nerves in the body to remember the feeling of swimming higher and faster and duplicate it the next time you swim with or without fins. By switching between wearing fins and not, you can duplicate this pattern over and over again leading to body position, technique and speed through the water.
So going on the information above, using a combination of swimming with and without fins would be very useful for swimmers.

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