You may start with light activities, such as walking, pelvic exercises on the floor or stretching. (newkidscenter.com)
You don't need to be a fitness queen but simple pelvic exercises from approximately the 20th week of pregnancy can help reduce the length of the second stage of labor. (pregnancy-info.net)
Certain pelvic exercises help to strengthen the abdominal muscles as a whole and keep the uterus, pelvis and baby in proper alignment. (mamanatural.com)