Problem analysis: Adjust the cushion to a proper height, with the patella in front of the knee, and the feet will relax when they are straight. When the foot bends more, the patella will become tighter and tighter, and the pressure will continue to rise. Therefore, when riding a bicycle, due to the repeated bending and straightening of the foot, the knee joint is constantly rubbed, and the patellar cartilage is prone to inflammation. To exercise strong and soft muscles and prevent sports injury of knee joint, you can do stretching exercise and weight-bearing training for a long time to exercise the bending muscles of quadriceps femoris at the back of thigh. If the quadriceps is strong, the knee will be stronger and the possibility of injury will be less. Exercise should be gradual. If you usually exercise less, or your muscles atrophy due to injury, then exercise should be gradual, and you can't force yourself to exercise at once.

Guidance and Suggestions: Regular and relaxed exercise habits should be maintained during riding.

I wish you the best of health!