Maya Angelou recites her poem 'On the Pulse of Morning' at the inauguration of President Bill Clinton on January 20, 1993.
Pregnant women could also go for a swim at a swimming pool, but it can also be risky in some circumstances. The chemicals used in swimming pools can be dangerous for moms-to-be and their babies, if too much is being added to the water, but normal levels of chlorine are generally OK unless the water is ingested.
I was browsing through Fit Pregnancy for dummies at the bookstore last night and it said that pregnant women were not supposed to swim in the ocean, lakes, or ponds. The reason given was the risk of getting an infection from the water.