Quadriceps strength exercises can be one of the must-have exercises for patients with osteoarthritis of the knee. Many doctors like to have their patients practice the “static squat”, which is similar to a “horse stance”. While this is undoubtedly a good exercise, it is not suitable for all patients, especially older adults who have no athletic base. The more you practice, the more it hurts. On the one hand, this may be due to inappropriate selection of items, and on the other hand, it may be due to incorrect practice methods and lack of attention to details such as avoiding pain arcs. For elderly patients who are over 50 years old and have a wide range of cartilage degeneration, I prefer to start with the simplest exercise of straight leg raising in bed, although there is only one movement, as long as you stick to it, you can see the effect.