(pelvic tilting variation)
Lie on your back, and put your arms by the side with the palms facing down. Bend your knees and keep your legs hip-width apart. Tuck your glutes and raise your back as you breathe in. Relax your back into a neutral position as you breathe out. Do this a couple of times.
Benefits: This position helps relieve back pain, a common problem during pregnancy. It increases the stability of the lower back.