Nicole Kidman is spinning her wheels -- her bike wheels -- during her new-ish pregnancy.

Kidman was spotted recently in a spinning class in Santa Monica, doing her exercise thing and staying in shape. Her baby bump was very apparent, say the sources who saw this mommy-to-be.

The soundtrack playing while Kidman pedaled away? Songs by Mary J. Blige, Bon Jovi, and Culture Club rocked the place. Her favorite, though, said a fellow gym-goer: songs by hubby Keith Urban.

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How many of us have splurged on an exercise for the home? Not many, I imagine -- I know buying one sure wouldn't be practical for me. But here's something neat that I read about on Fitsugar -- An attachment for your regular bike that makes it a stationary bike! They come in two style:

• With the Blackburn TrakStand Mag ($159.99), you mount your back wheel onto the stand and remove your front wheel -- the, peddle away!
• With cycling roller ($169.99), you basically ride your bike indoors on a set of rollers. It's harder than it looks -- you have to be really careful to keep on a straight and narrow path.
  

Cool, huh? Would you try it?

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