1, because the density of water is greater than that of air, the resistance to movement in water will be greater than that in air. This makes it easy for people to feel tired when swimming in the water, and they want to have a rest when they feel tired. This is not conducive to losing weight. Generally speaking, it takes 30 minutes to exercise before you start to consume fat. If you stop for less than 30 minutes or just enough, you won't be able to lose fat. 40 minutes is the best exercise time, so every swimming should last about 40 minutes.

2. Swimming needs to be practiced in different periods. Like professional swimmers' training, swimming is divided into four segments, with interval rest 15-30 seconds. The specific arrangement is to swim 1 round trip, then swim 2 round trips, then swim 2 round trips, and finally swim 1 round trip, and each section ends with a quick swim.

3, everyone's obesity problem is different, some people are obese in the lower body, and some people have thick arms. Although swimming is a whole-body exercise, there are differences in different swimming strokes for body parts. The following four postures are the most commonly used postures in swimming. You can choose the posture that suits you for training by comparing your figure.