The pain in the buttocks the day after exercise may be due to a local muscle or ligament strain accidentally during exercise, or of course, there may be a local lesion that just induces pain from exercise. You can consider going to the hospital to see a doctor for an interview, and the doctor will make a preliminary analysis with the physical examination. It is possible to routinely improve the pelvic x-ray to help determine whether there are significant local bone abnormalities. If the pain is just a general muscle or ligament strain, local medication and physiotherapy are mainly used. You can use some painkillers, such as etofenacin gel, in addition to local hot compresses, and also with some creams such as pain relief cream. Temporarily avoid long-distance walking, strenuous exercise, appropriate more rest to help relieve local pain.