High intensity exercise competes with pregnancy for oxygen and
nutrients
Uterine blood flow decreases with moderate and high intensity exercise
Some positions - standing still or lying on your back for a long time - may contribute to blood pressure syndromes and loss of uterine blood flow
Stress hormones associated with a competitive exercise environment may contribute to premature labor
The need for protein and water is increased
Sudden, jarring movements may have negative effects
Splinting the Abdomen During Curl Downs:
After 20 weeks, use curl downs to strengthen abdominals. Be sure to "splint" or pull the sides of the abdomen together while curling down as shown in photos: