In addition, postpartum exercise and general fitness can't be put together because of some physiological changes unique to pregnancy, which most people can't satisfy at all! Unique mechanical mechanism. It is said that postpartum fitness is different from ordinary fitness because one is "internal force" and the other is "external force". When the uterus gets bigger, it will directly squeeze the muscles and internal organs up and down, left and right. This power is from "inside" to "outside". For example, some sisters sometimes feel breathless during pregnancy because the internal organs and respiratory muscles (diaphragm) are "topped" by the uterus. Some sisters feel that going to the toilet becomes more frequent because the bladder is squeezed. These are not "diseases", but normal physiological phenomena during pregnancy. So all postpartum recovery is also based on "internal" recovery. In the fitness plan of ordinary people, the strength comes from the outside, and the "internal force" is rarely considered, so most of their plans are not suitable for postpartum.