Breaststroke can lose weight by breaking up and pressing the wrist, pulling the fiber with double anchors, holding the water with high elbows, and turning hands and lifting shoulders. The neck comes out of the water, the snake waist drags your hips, your knees are lowered, your feet are everted, your head is hidden in the water, your arms are folded and your shoulders are hidden, your inner ankles are backward, and your pedal clips are rotated downward. The front is low and the back is high, stretching the sand, stretching the legs and abdomen, the backstroke water overflows the cheeks, and the nose is swollen. Split the water with a sharp knife and stretch your arms to send your hips. Cross your hands with water, bend your elbows and collapse your shoulders, push the front line, caress your legs and stick to the edge. Keep your ankles straight, bend your feet inward, kick up and press down, and swing your toes. Wipe your head on the water in freestyle, keep your chin straight and take a deep breath. Keep your whole body stiff, keep your waist and abdomen tense, roll the log and look at the sides of your navel. Stretch. Legs are like springs, ankles are relaxed, relaxed and nervous. Butterfly stroke, chest and armpit press down, elbows apart, belly in and hips up, following the iron law of entering the water. Side-pressure paddling, power internal scanning, tiger back rising, arms swinging back, wings moving leisurely, elbows high and elbows low. Legs rise and fall, from the back of the waist, showing a snake shape. I think the first item is the national flag.