If the leg pain occurs the next day after the leg press, it is normal for the muscle pain to be caused by lactic acid buildup due to anaerobic muscle metabolism during the leg press, which usually disappears after more exercise. However, if the excessive leg press causes ligament damage, this pain may require treatment, usually need to go to the hospital for a local MRI to check the soft tissue damage, if there is ligament or surrounding soft tissue damage to stop continuing to exercise, but also to give physical therapy or drug treatment. Any exercise is to be gradual, if excessive exercise in a hurry will lead to injury in the sport, the loss is not worth the gain.