The disadvantages of in-situ high leg raising mainly include affecting blood circulation in the lower limbs, which may cause muscle strain, ligament strain, gas, spinal pain and so on. 1. Affecting blood circulation in the lower limbs: In-situ leg raising helps the blood in the lower limbs to return to the heart and promotes blood circulation in the whole body. However, if the intensity of the activity is too great without proper rest, it will make the lower limbs not circulate well and cause congestion and swelling, or even numbness, pain and other manifestations. 2. Muscle strain, ligament strain: when performing in-situ leg raising, muscles and ligaments may be damaged due to inaccurate posture or excessive exercise intensity. It is recommended that stretching should be done well before formal exercise. 3. Breathlessness, spinal pain: If the exercise is too violent, it may lead to localized breathlessness. There is a certain impact on the spine, so it may cause spinal pain. The line of in situ high leg raising exercise should pay attention to the standardization of movement, not too much force, to do the tension and relaxation, in order to avoid unnecessary injuries.