1, what is the pelvic floor muscle? Pelvic floor muscle is the muscle group that closes the pelvic floor. This muscle group is like a “hanging net”, the urethra, bladder, vagina, uterus, rectum and other organs are tightly held by this “net”, so as to maintain a normal position in order to exercise their functions. 2. Why is the pelvic floor loose? What are the risks of pelvic floor relaxation or damage? Pregnancy and childbirth is a major cause of pelvic floor muscle relaxation, which causes the pelvic floor muscles and their fascia to expand and lose their elasticity, and often some of the muscle fibers break, thus making the pelvic floor muscles loose. Once the pelvic floor muscle is damaged, the pelvic organs will not be able to maintain their normal position, which will lead to corresponding dysfunctions, such as vaginal laxity, uterine prolapse, incontinence, and dysfunctions in sexual life. 3.What is pelvic floor rehabilitation training and how to do it? Pelvic floor rehabilitation training is a training that enhances the muscle strength of the pelvic floor and regulates the nerve function of the pelvic floor muscles through active or passive exercise of the pelvic floor muscles. Depending on the individual situation, the training can be done at home or in the hospital. Experts remind: 42 days after delivery is the best time to start pelvic floor muscle training, which can effectively prevent the occurrence of pelvic floor muscle relaxation, stress urinary incontinence, uterine prolapse and other diseases.