In order to completely reduce body fat and fat, many people will do it through exercise. The most popular way to lose weight is to use a treadmill. The weight loss effect of the treadmill is really good, but some people can't lose weight through this kind of exercise. Many people think that exercise is better than no exercise, but the choice of exercise mode is mostly based on preference, regardless of whether it is suitable or not, which often leads to sports injury. The same is true of treadmill exercise. Experts say that running on a treadmill is different from normal running: the speed and frequency of normal running can be controlled by yourself, and you can run if you want, and stop if you want, so it is not so laborious to run; Running on a treadmill is usually set at a relatively fast speed with a fixed frequency. As long as the treadmill doesn't stop, people have to keep running with the rhythm, and it is easy to fall when they stop suddenly, which is not good for the heart. Besides, the track of the treadmill keeps turning backwards. When people run on it, their attention must be highly concentrated and they can't be distracted. Their physical tension is much higher than normal running. In view of the above characteristics of the treadmill, experts believe that four types of people are not suitable for treadmill exercise 1, people with arthritis, meniscus or ligament injury or artificial joint replacement, because high-frequency running will cause repeated wear and tear of hip joint, knee joint and ankle joint, and people with joint problems will be injured more and more; 2, heart disease patients, because the speed of the treadmill is difficult to control, the heart load is also relatively large, once an accident occurs, it is very dangerous; 3, people with cervical spondylosis and lumbar spondylosis, because running in a highly concentrated state for a long time will lead to neck and back muscle tension, and the treadmill also has recoil on the spine, which may aggravate the original condition; 4. Osteoporosis patients are prone to sprains and falls during high-intensity running due to decreased bone density and loose ligaments, leading to fractures. Although it is good to lose weight on the treadmill, the above four groups of people can't exercise on the treadmill to lose weight. Therefore, in order not to cause unnecessary harm, the above four groups of people had better not use treadmills for exercise.