Most people measure the quality of butterfly swimming to see if he can expose his buttocks from the water when swimming in. So what movement does the buttocks from the water when it is buttocks? Leg-knocking, the appearance of dolphin-style leg punching is reflected in "the hip is under the foot when it is under, and the hip is under the foot when it is under", so if you want to expose your hips from the water, then using heavier leg punching can be done easily.
But does each of us enthusiasts have heavier kicks twice? Of course not. If you carefully observe the position of the hips when the athlete is hitting the legs, you will find that not every athlete will expose his buttocks from the water every time he hits the legs. Some athletes' first kick, that is, when the arm is stretched into the water, it is more common for the hips to be exposed to the water. This type of leg kick is more common among athletes in the 200-meter world.
The reason is that the arm is stretching underwater at this time, so the high point of the hip position will help the body to advance forward. The above example also shows that many athletes' first kick when they enter the water is heavier. So should the buttocks also be exposed to the water during the second kick? In fact, if the second kick of the leg is exposed to the water, it will cause the hip to remain at a higher position, which will cause your head to sink when you move your arms in the air. The most direct consequence is that it will cause you to breathe.
Usually many enthusiasts will encounter a difficult place to grasp when they beginners in butterfly swimming, that is, if the second leg is the leg that lets the body come out of the water, if the stroke is light, the arm cannot get out of the water. If the stroke is heavy, the arm can get out of the water, but it will make it difficult for you to breathe. This is actually very easy for enthusiasts with better mastery of technical structure and rhythm, but beginners usually cannot swim out of the comfortable butterfly swimming because of this bottleneck.
So should the second leg be light or heavy?
Currently, there are three main types of leg beats in butterfly strokes. The first time is heavy, the second time is light
2, the first time is light, the second time is heavy
3, and the two even leg beats
First look at the first type:
It is necessary to heavi the legs for the first time, because as mentioned above, the exposed surface of the buttocks on the water during the first time is conducive to the body moving forward, because when the arm is stretched, the arm movement actually loses the propulsion force. It is necessary to increase the propulsion force by heavy hitting the legs during this period. Why is the freestyle of six legs fast? It is because when the arm loses power or weakens, it has a kick as a support to perform power output and cuts.
However, butterfly swimming is an uneven swimming posture. When the arms are moved in the air, there is no power output. We should hit the legs hard when the arms are stretched. First, maintain the sliding posture on the hips and under the hands, and second, reduce stalls and increase propulsion.
Let’s look at the third type of leg kick:
Two uniform leg kicks are also feasible. A previous article I mentioned that the reason why the speed of butterfly swimming is not as fast as that of freestyle is because there is no power output at the moment when the arm is moved in the air, and it can only rely on the inertia of the arm swing flat, which will cause the speed drop. Therefore, the second leg kick can increase the speed peak when the arm is released, so even the speed drop is not that serious when the arm is released.
Two uniform kicks can fully reduce the time of speed drop, shortening the time of "deceleration" of the butterfly stroke speed bottleneck. So it is also possible to beat the legs evenly twice.
So what about the second type of leg slap?
The first light is not desirable, because the longest distance for butterfly stroke is 200 meters. For short-range swimming postures, it is necessary to increase the propulsion force. If the leg cannot provide corresponding power supplement when the arm is propulsion force lost, the unevenness of the speed of swimming will undoubtedly increase energy consumption. Therefore, I think the first light and the second heavy are not the best choice.
To sum up, the first heavy, the second light, or the even kicking of the leg should be better than the first light and the second heavy.It is necessary to expose your buttocks to the water for the first time. Of course, some long buttocks swim enthusiasts use lighter legs twice in order to save their energy. Although their buttocks are close to the water surface every time, this does not mean that they are not swimming buttocks, because their legs are far away from the heart and blood is flowing back for a long time, and the energy consumed by the kicking legs is huge. If you want to swim for a long buttocks, you can also use lighter legs twice.
So, when swimming buttocks, water or water is not available for the first leg hit and the second leg hit. Water is also available for the first leg hit and the second leg hit, but water is not available for the second leg hit. However, water is not available for the second leg hit and buttocks, water should be the most undesirable for the second leg hit and buttocks.
