Shaking legs generally does not lead to thick legs, can to a certain extent exercise leg muscles, but the effect is not significant. Shaking legs will exercise the leg gastrocnemius muscle and flounder muscle, at the same time will accelerate the circulation of blood in the legs, so shaking legs has a certain role in exercising muscles, but its effect is not as significant as running, walking and other forms of exercise. General leg muscle exercise needs to develop a standardized and appropriate amount of exercise planning, such as resistance exercise and running, etc., so shaking the legs of this habitual exercise will not lead to leg thickening. Some people are accustomed to shaking their legs while crossing their legs, which will further increase the load on the hip joints and lumbar spine, which is not good for human health, in addition to shaking their legs will emit noise, which will also interfere with other people’s work and rest to a certain extent, and try to minimize the shaking of the legs in their lives. After shaking legs if the body appears to be uncomfortable, should immediately seek medical attention, to avoid injuring the lumbar spine and other parts of the body due to bad posture.