Butterfly swimming, also called dolphin swimming, got its name because the leg movements resemble those of a dolphin. I have compiled the techniques of hand and foot coordination in butterfly swimming. Welcome to appreciate and learn from them.
Butterfly stroke generally uses one arm movement, two kicking movements, and one breath.
When your arms enter the water, push your legs down into the water, dive your head into the water, and hold your breath or exhale.
When holding the water with both arms, push the water up with the legs, while the head is still submerged in the water.
When the arms are paddling to the bottom of the abdomen, the legs are pumping down again, raising the head and taking a quick breath.
When the pushing of the water with both arms ends, the pushing of the water with the legs downward also ends. The head dives into the water again and holds its breath or exhales slowly.
When the arms are moved, the legs begin to make the next upward water movement, and the head is submerged in the water to slowly exhale or hold your breath.
When kicking in butterfly stroke, the legs should be kept together naturally, and the heels should be slightly separated to form an "inward figure". When the legs kick downward in the previous stroke cycle, the feet will be at the lowest point, and the knee joint will be at the lowest point. Straighten, lift your hips to the water, and bend your hip joint to about 160 degrees.
Then straighten the legs and move upward, gradually unfold the hip joints, and sink the buttocks.
When the legs continue to move upward, the thighs begin to press down, the knee joints press down with the thighs, and the movement naturally bends, and the thighs continue to accelerate downward.
As the degree of knee flexion increases, when the feet are raised close to the water, the hips drop to the lowest point. When the knee joints are bent to an angle of about 110-130 degrees, the feet are raised to the highest point and downward accurately. Fetch water from behind.
When your feet push water downwards, relax your ankle joints, straighten your feet, and then push the water back and down with your calves and thighs accelerating. Both feet continue to accelerate and push water downwards. Before the movement is over, the thighs begin to move upward again. When the knee joints are fully straightened, the downward kicking movement ends.
The kicking action of the butterfly leg is driven by the waist, passes through the hip, knee, and ankle joints, and is completed in coordination with the movements of the trunk and spine. The direction of movement of the foot is downward and backward, and its downward amplitude is greater than its backward amplitude.
When pushing up and lifting, the knee joint must be straight. If it is slightly bent, the back of the calf will produce great resistance. In addition, when lifting your legs upward, do not use too much force to reduce resistance. The focus of the kick should be on the downward movement of the water. The speed of the downward movement of the leg should be more than twice as fast as the upward movement of the leg.