Second, get ready for activities before launching, and do flexion and extension exercises of arms, legs and waist for 3-4 minutes.
Third, the water temperature should not be too low. Beginners had better start in summer, so it's easy to adapt.
Fourth, the amount of exercise should be appropriate. Beginners should not run for too long. They should stop to have a rest every 50 meters, and the speed should not be too fast.
Fifth, pay attention to self-supervision. If you feel dizzy, sick, tired or unwell after swimming, you should reduce your activities or suspend your exercise.
Sixth, pay attention to safety. We should go hand in hand and take care of each other. Don't swim in places with rapids and eddies, and don't swim in areas with dense aquatic plants to avoid accidents.
Seventh, you should swim slowly and don't jump into the water suddenly. First, wash your shoulders and chest with water and walk slowly to the swimming area. Beginners should be familiar with water first. Then learn the technical movements step by step, first decompose the whole set of movements and practice them separately; On this basis, do a whole set of coordination exercises. Old and infirm people should pay more attention to what they can do, move steadily, and should not exercise too vigorously.