In cold winter, the swimming time and distance should be reduced accordingly because of the rapid heat dissipation and large heat consumption. When the water temperature is lower than 10℃, the underwater time should not exceed 15 minutes. The lower the water temperature, the shorter the underwater time. For beginners, there should be a gradual process.
For beginners in swimming, the main purpose should be to make the technical movements easy and smooth, and not to pursue efficiency and speed too much.
Precautions for swimming
1, warm-up exercise must be done before swimming, otherwise improper exertion during swimming will cause muscle ligament strain.
2. After finishing the warm-up exercise, you should pour some swimming pool water on your body first, so that your body can get used to it before entering the water, otherwise it will easily lead to cramps.
3. The swimming time should not be too long, and it is better to swim within two hours.
Wash your eyes with clean water every time you finish swimming. If there is water in the ear canal, it must be cleaned up and then bathed to reduce the chance of contracting infectious diseases, such as conjunctivitis, otitis media and dermatitis.
5, don't swim on an empty stomach and a full stomach, swimming on an empty stomach is easy to make people collapse, and swimming on a full stomach will produce bad symptoms of the digestive tract.
6. Women can't swim during menstruation.