Pelvic floor exercises can help strengthen the muscles around the vagina and pelvis. The pelvic floor muscles support the baby, uterus and abdominal organs. Breathing exercises can help you relax and be very helpful during labor, especially if they become habitual. Stretching can relieve leg cramps and backaches. Stretching can also help tone muscles. Stretches would include bends (back muscles), trunk twists (stomach and back muscles) and calf stretches. Ask your physician about proper technique for stretching exercises.