Can middle-aged and elderly people stay fit by walking on cobblestones?

　　Aunt Zhang, who lives on Shouyi Road, Wuchang District, Wuhan, has a cobblestone path in front of her hospital. Everyone likes to take off their shoes and walk back and forth on the road barefoot to activate the meridians by stimulating the acupoints on the soles of the feet.
　　
　　Aunt Zhang also wanted to relieve her knee pain, so she walked for half an hour every morning and evening. As a result, after a few months, the pain in her knee joint still persisted. She thought it was because she did not exercise enough, so she walked for an extra half hour. As a result, the knee joint was swollen and painful the next day, and she had to see a doctor.
　　
　　People of Wuhan University Hospital Associate Professor Ming Jianghua from the Department of Orthopedics said, elderly Generally, there are varying degrees of bone and joint degeneration sexually transmitted diseases Due to degeneration and osteoporosis, the joints are not as smooth as they were when they were young. If you walk on uneven cobblestones for too long, it will aggravate the wear and tear, causing knee joint swelling and pain.
　　
　　Associate Professor Ming Jianghua pointed out that the elderly should avoid walking on long walks for fitness and should spend about 15 minutes in the morning and evening on cobblestone fitness trails. In addition, the load on the joints of the elderly when climbing stairs is four to five times that of usual. After walking a long way, they should try to hold on to the railings or walls when going upstairs, and do not step up the steps.