First, selecting the right swimming location is crucial. Avoid swimming in polluted or poor-quality rivers, lakes, or seas, as these environments can harbor bacteria harmful to health. Similarly, refrain from swimming in rivers where conditions are unclear, as this poses significant risks.
Second, proper preparation before entering the water is vital. Aim for about fifteen minutes of warm-up exercises to loosen your joints and muscles throughout your body. This ensures your entire body is relaxed. Otherwise, diving straight into vigorous activity risks muscle and joint injuries or other accidents. Leg cramps often result from insufficient warm-up before swimming.
Third, manage your swimming duration wisely. Avoid prolonged periods in the water, as prolonged exposure to cold stimuli can cause rapid blood vessel constriction. This shifts the body's heat loss function beyond its heat absorption capacity, leading to shivering. Exit the pool promptly when this occurs.