You are designing an exercise program for a woman in the early stages of pregnancy. The woman had a problem with urinary incontinence during her last pregnancy. Which of the following muscles should be strengthened?
1. Piriformis, obturator internus, and pubococcygeus
2. Obturator internus, pubococcygeus, and coccygeus
3. Rectus abdominis, iliococcygeus, and piriformis
4. Iliococcygeus, pubococcygeus, and coccygeus
The correct answer will be posted in a few days.