Writing ideas: Scientific physical exercise needs to pay attention to the following problems, so as to avoid not only not getting exercise but hurting the body.

First, grasp the degree of load. When doing strength exercises, you should choose the appropriate load according to your actual situation, but no matter what kind of load you choose, you should follow the principle of growing from small to large, and don't suddenly increase the exercise load to cause sports injuries.

Second, pay attention to the speed of action. As long as dynamic muscle strength exercises are carried out, there is a problem of movement speed, and load is closely related to speed. The greater the load, the smaller the speed. Exercisers should make reasonable arrangements according to the practice requirements. For teenagers, explosive power is very important. In strength training, it is very beneficial to choose appropriate load and speed up the movement as much as possible to improve the explosive force of muscles.

Third, control the amount of exercise. For ordinary physical exercisers, it is not necessary to carry out strength training every day. Even for the purpose of developing muscle strength, adopting strength training every other day is enough to achieve the ideal effect. If you do strength exercises every day, not only the effect of improving muscle strength is not obvious, but also the development of overall function is not coordinated.

Besides, physical exercise should also follow some basic principles. Although the physical exercise method is simple and easy to learn, we must pay attention to these principles if we want to arrange physical exercise scientifically, improve the exercise effect and avoid injury.

(1) Principle of gradual progress: The gradual progress of physical exercise refers to the gradual progress from small to large, from easy to difficult and from simple to complex when learning sports skills and arranging exercise amount.

(2) The principle of all-round development: In physical exercise, we should pay attention to the diversity of activities and the overall improvement of physical function.

(3) Principle of differentiated treatment: When exercising, we should treat each exerciser differently according to his age, gender, hobbies, physical condition, professional characteristics and exercise basis, so as to make physical exercise more targeted.

(4) Principle of regularity: Only by participating in sports activities regularly can the effect of exercise be obvious and lasting, so physical exercise should be regular, and you can't fish for three days and dry the net for two days. Although short-term exercise will also have a certain impact on physical function, once physical exercise is stopped, this good effect will soon disappear.

(5) Safety principle: Pay attention to safety in any form of physical exercise. If the physical exercise arrangement is unreasonable and violates scientific laws, injury accidents may occur.