1. Kneeling posture can reduce the stress on ankle joints and exercise the strength of lower limbs and upper abdominal muscles. Incorrect training or overwork will lead to knee joint injury, which is manifested as meniscus injury, cruciate ligament injury, or collateral ligament injury, thus causing knee joint pain, limited activity and other clinical symptoms. It can also lead to patellar wear, patellar avulsion fracture or patellar traumatic fracture, causing knee joint swelling, pain, patellar fracture and so on. In the process of kneeling, the calf will be in a state of flexion and extension, and the blood circulation will slow down, forming a thrombus.

2. Rocking the sea is a self-care exercise. On the basis of sitting quietly, the exerciser gently rotates and shakes the upper body, so that the internal organs, limbs and mental arches are exercised, which promotes the full and normal operation of meridians, harmonizes qi and blood, enhances the functions of viscera, cures diseases and strengthens the body. There are no obvious side effects.