This exercise strengthens your lower back and pelvis. It is for use during the first 4 months of pregnancy. After this point, lying on your back is not recommended, because it can cause blood circulation problems for you and your fetus.

1. Lie on your back.
2. Keep your knees relaxed.
3. Tighten your belly and buttocks muscles.
4. At the same time, gently shift your pelvis upward. This should flatten the curve in your back.
5. Hold for 6 seconds and then relax.
6. Gradually increase the number of tilts you do each day, to your comfort level.