Butterfly stroke is also a good weight-loss stroke, that is, it uses the strength of the waist to affect the whole body, and the arms also need to stroke inward, just like doing chest expansion exercise, but it requires more strength than chest expansion exercise, so it can get better exercise effect. People who use butterfly stroke to lose weight for a long time can lose fat around the waist and make the waist softer.
Key points of breaststroke
1, the swimmer is in gliding posture and his body is close to horizontal. About 80% of the head is submerged in the water, the face is slightly forward, the arms are extended, and the palms are inclined outward.
2. The water receiving action starts from about 7~9 inches underwater, and both hands paddle horizontally. At this time, the exhalation action begins.
3. There is no obvious flexion of the arm, continue to paddle outward, and the exhalation continues to increase.
4. When the swimmer's head starts to lift slightly, the elbow joint starts to flex and the upper arm starts to rotate.
5. When the arms reach the maximum width, the elbow flexion is about 1 10 degrees, and then the elbow posture is obvious.
6. Raise your head. When your mouth comes out of the water, finally exhale. Your hand begins to move inward to complete the final push.
7. When your arm is ready to go backwards, inhale and don't pull your elbow under your ribs. Your knees begin to bend and your legs begin to move back.
8. Close your mouth, inhale, bring your feet to your hips, keep your elbows extended, and keep your arms moving forward.
9. Leg return movement continues.