Jumping rope activities are not recommended if you have bad knees. Jumping rope tends to cause wear and tear and increased loading on the knee joint, which may lead to aggravation of knee injuries. Because of the repeated bending of the knee occurs when jumping rope, at the same time, bouncing will increase the load of the knee joint, which can increase the wear and tear of the knee cartilage and increase the load of gravity, which can lead to meniscus damage or ligament damage of the knee, stimulate osteophytes to cause osteoarthritis, and exacerbate the pain of the knee joint. Therefore, people with bad knees should reduce activities such as jumping rope, running, etc. They should pay attention to the protection of knee joints, reduce joint activities and loads, and can carry out slow walking, swimming and other sports to reduce the weight-bearing and wear and tear of joints. If bad knees and pain and other uncomfortable symptoms, it is recommended that the patient timely hospital consultation, after a clear cause for standardized treatment, and do a good job in daily life of local cold protection and warmth, to protect the knee joints.