How old are you now? When anyone practices fork, the thigh root, knee joint and ligament will feel painful and torn! If you are still under 18 years old, the vertical fork and the horizontal fork are relatively easy to practice, and the pain is relatively weak, because the bones of minors are still in the development stage and the cartilage tissue has not been fully integrated. If you are over 20 years old, your bones will be basically shaped by then. If you practice the fork again, the pain will be very obvious, and you need strong endurance and perseverance to help you achieve the effect. Also, practicing the next fork will not be successful for a while, and it will take a long time to slowly run in. If you are too anxious and too hard, it is easy to cause strain, and it hurts every day when you touch it! Then warm up. You must warm up before you get off the fork. Warming up can reduce your pain. If you get off the fork without warming up, it is likely to cause strain or tragedy! Wish you success!