Freestyle is the fastest and least resistance among the four strokes, and it has unique advantages over the other three strokes:

First, the prone body posture is very conducive to the exertion of physical strength;

Secondly, the straight body posture is the least resistance among the four swimming strokes. Even breathing is done by turning your head sideways without raising your head, so it will hardly affect the streamline of your body.

Third, paddling alternately with both arms and kicking alternately with both legs, there is almost no deceleration during swimming, which can continuously provide power.

Fourth, arm paddling is driven by the rotation of hips, which is precisely to use large muscle groups to reduce the pressure on the arms.

If it is the most effective way to keep fit or lose weight, these swimming strokes can only be said to be equal, because each swimming stroke can achieve better fitness effect as long as it is used properly. As for losing weight, as long as you control the intensity of exercise and then control your diet, losing weight is not a problem. The effect of fitness and losing weight lies in methods and persistence.

I hope I understand the meaning of the question correctly, and I can help you.

Let's not talk about the most efficient swimming stroke (swimming stroke) here, because this is more professional, and my answer is not very good, hehe ... This question actually puzzles me a little, so let's talk about my personal opinion according to my own understanding. Under normal circumstances, the purpose of people's swimming exercise is nothing more than keeping fit, because swimming is one of the best aerobic exercise methods, so I think swimming can be regarded as an effective exercise method, as long as you can persist in swimming for a long time. So how to swim can be said to be the most effective. I think it mainly depends on what the purpose of swimming is. In addition to the most fundamental purpose of strengthening the body, more specifically, some people are trying to lose weight and shape, some people are trying to relax, and some people may just have fun. But no matter what the purpose is, the prerequisite for effective swimming is good water quality and proficiency in basic swimming skills.

Because everyone's purpose is different, no matter what swimming style, there are different swimming styles to achieve their goals. If you want to achieve some fitness and weight loss, you need to swim at a certain speed. It doesn't matter if the swimming style is not standard, but you must swim with a strong sense of quantity. After swimming, you should let yourself gasp and feel tired, that is, you must make goals and exercise plans. If the main purpose is to relax, it doesn't matter how long and how fast you swim. Just take a leisurely and healthy trip. You can swim flat frog, slowly and thoroughly. Running a kilometer will not be tiring, but will be very relaxing. If it's just entertainment, you must be good at swimming and diving, otherwise you won't have fun.

I have been swimming for many years. I lost weight in the early stage of high-intensity swimming, and I relaxed in the later stage, so for me, swimming is the most effective anyway, because I love swimming! I think the old drivers who love swimming feel the same way. Although I have not gone through formal study and training, I have also summed up a lot of swimming experience, hoping to communicate with the vast number of swimmers here and make progress together.