Exercise first, then swim. Breaststroke has a large stretch, which can effectively move all joint muscles and reduce the possibility of injury to fitness muscles, and can be used as a substitute for warm-up activities. After fitness, glycogen is consumed in muscles and a lot of lactic acid is produced. At this time, aerobic exercise consumes fat energy, which can achieve the effect of increasing muscle and reducing fat. My recommended exercise sequence is: warm-up, fitness, swimming and stretching. Stretching can relax muscles, reduce muscle soreness and prevent continuous training due to muscle soreness. Long-term adherence to aerobic and anaerobic exercise will give you all-round health from the inside out. Adopt it