We recommend the use of resistance training for patients who present with postoperative muscle weakness. The purpose of this training is to improve and prevent muscle weakness. The drawback of resistance training exercises is that the patient needs to understand the training and its effects; if executed incorrectly, resistance training is ineffective. Furthermore, if an incorrect exercise program is followed, trauma may occur. Therefore, physical therapists should inform the patients of the relationship between the necessity of resistance training and the ability to perform activities of daily living. Furthermore, the physical therapist should have personally experienced resistance training to understand its effects. This study provides important information for patients undergoing resistance training. In this paper, I would like to report the effective method of resistance training.