(a) to achieve the "six noes": do not swim in the water without permission; Don't swim with others without authorization; No organization, no swimming; Don't swim in waters without safety facilities and ambulance personnel; Don't swim in unfamiliar waters; Do not take students who can't swim into the water for rescue.

(B) swimming safety points

Don't be too hungry and full when you go into the water. Don't go into the water for an hour after meals to avoid cramps; Try the water temperature before entering the water. If the water is too cold, don't go into the water. If you swim in rivers, lakes and seas, you must have a companion. You can't swim alone. Observe the swimming environment before launching. You can't swim here if there is a danger warning.

Don't swim in the canyon with unclear geographical environment. The water in these places is different in depth and cold, and obstacles may hurt people in the water, which is very unsafe; Before diving, make sure that the water depth here is at least 3 meters, and there are no weeds, rocks or other obstacles underwater. It is safer to enter the water with your feet first.

(3) How to prevent lower limb cramps when swimming

You must warm up before swimming. You should consider your physical condition before swimming. If you are too full, hungry or tired, don't swim. Before swimming, splash some water on your limbs and then jump into the water. Don't jump into the water at once. If you have chest pain while swimming, you can press your chest hard and wait until it is better. When you have abdominal pain, you should go ashore. It is best to drink some hot drinks or soup to keep warm.

(D) Summer swimming and drowning self-help strategies

How to ensure the health and safety of swimming and avoid drowning? Unfamiliar with the water situation, rushing into the water can easily lead to life-threatening. For the unfortunate drowning incident, experts said that drowning people should not panic, but should remain calm and actively save themselves:

(1) For people who have cramps in their hands and feet, if they have cramps in their fingers, they can hold their hands tightly, then open them forcibly and do it several times quickly until the cramps are eliminated.

(2) If the calf or toe cramps, first take a breath and float on the water. Hold the toe of the cramped limb with the hand on the opposite side of the cramped limb and pull it in the direction of the body. At the same time, press the palm of the same side on the knee of the cramped limb to help the cramped limb straighten.

(3) If the thigh cramps, it can also be solved by lengthening the cramped muscles.