Calf cramps, also known as “gastrocnemius spasms”, are mainly cramps in the heart of the foot and the belly of the leg. When the attack is not only painful, but also can not move, often occurs when swimming. If not rescued in time, often drowning and death. First aid measures 1, when swimming calf cramps, must not panic, first take a deep breath, dive head into the water, then like a jellyfish, so that the back floats in the water, both hands grab the toes, pull hard in the direction of their own. If you’re not able to do it once, you can repeat it several times, and your muscles will slowly loosen up and return to their original state. If you try to get to shore, it will often backfire and drown. So, even if you don’t have cramps while swimming, you should practice this first aid method again and again. 2, in daily life, calf cramps often occur, at this time, you can quickly pinch the hand Hegu point (that is, the arm tiger mouth, the first metacarpal bone and two metacarpal bone in the middle of the trap) and the upper lip of the point (that is, the upper lip is in the middle near the top). After pinching for 20-30 seconds, the pain will be relieved and the muscles will be relaxed, with an efficiency of up to 90%. If combined with hot hand towels to press and massage with your hands, the effect will be even better. Attention 1, calf cramps are caused by insufficient blood supply to the muscles when strenuous exercise or cold feet are suddenly performed. Sleep deprivation or failure to eat breakfast before swimming may become a trigger, so pay attention to adequate rest and nutrition. 2, before swimming must make preparatory gymnastics, to prevent the sudden occurrence of calf cramps while swimming.