(WKBW/ABC News) Researchers are releasing updated guidelines on exercise during pregnancy.
They are encouraging moms-to-be to do some muscle strength exercises using light weights, one to two times a week.
Researchers recommend using resistance bands to keep free weights from hitting the stomach.
Also, they say don't lift while flat on your back. It can inhibit blood circulation.
For aerobics, the recommendations are either walking for about 11-hours a week, or swimming or riding a stationary bike for about 5 hours a week.
The authors say the potential risks to mother and fetus are small compared to the benefits gained from regular physical activity.