The main reason that can lead to leg pain after climbing is the mild damage produced in the leg muscles, as well as causing a large accumulation of lactic acid within the leg muscles, caused by the relatively large amount of exercise. To relieve leg pain after climbing: first, be sure to do systematic stretching, stretching can make the thigh muscles significantly relaxed, so that the pain symptoms can be soothed. Second, do appropriate massage for the painful parts. Preferably, you can use roller massage, which can loosen and massage the deep muscles and fascia to make the lactic acid discharge faster. It can also be combined with microwave physical therapy or even the use of blood-activating medication to promote lactic acid metabolism and muscle recovery.