My child recently developed a painful patellofemoral joint strain in his knee due to school gym class exercises (exercise squats), but I didn’t pay attention to it. Today was a day of clinic with many patients. Among them, six young patients, ages 11 to 15, all elementary and middle school students, were seen, although their conditions varied, with diagnoses of tibial tuberosity epiphysitis, patellofemoral strain, ankle sprain, posterior tibial tendonitis, and fatigue osteochondritis of the middle and lower tibia. Although such patients used to be frequent and in some children more serious, such as fatigue fractures of the tibia. Of course these are not specific diseases, but they often require rest or simple treatment. Why do I bring this up today, but my impression is that most of these students are very difficult and their parents are more anxious not to rest because of school or academic performance, but rather they have to persevere. From a doctor’s perspective I would suggest that strenuous activity needs to be avoided. However, I wonder if the school pays attention to the children’s post-exercise when doing some physical exercise, and suggests hospital visits for some children with obvious symptoms, etc. Or, the best way is that the relevant departments can hold relevant training and ask experts in sports medicine to give basic medical guidance to physical education teachers to make physical exercise more scientific, thus relieving parents and children of their doubts and worries.