The actress is getting on her bike – stationary bike, that is – for a spinning class at Montana Avenue's Revolution Fitness in Santa Monica. The actress was spotted taking a class from teacher Bobby Neely on Sunday, sporting a white T-shirt, black leggings and, of course, her baby bump. Kidman sat on a bike next to her personal trainer and rode to a soundtrack including songs by Mary J. Blige, Bon Jovi and everybody's favorite '80s icons, Culture Club. But Kidman seemed especially tickled by a Keith Urban song, a fellow gym-goer says. SOURCE

ABOUT SPINNING (AOL):

• Cost: Ranges widely. Individual sessions can be as low as $5 or as high as $20
• Time Commitment: 2 to 4 classes (typically 45 minutes) a week will help with toning and weight loss.
• Location Limitations: N/A.
• Special Equipment Required: Padded shorts are recommended.
• Potential Pitfalls: N/A.
• Boredom Rating: The fast pace of the class and the upbeat music typically overrules the ‘lack of scenery’ element.
• Potential Injury Risk: As long as the bike is set up properly, injury risk is low.
• Level of Fitness Required: N/A.
• Calories Burned (based on a 150 pound woman exercising at a moderate intensity for 30 minutes): 200 to 325 calories.
• Body Parts Worked: Legs, butt.
• False Myths: If you’re steered away from spinning out of fear of developing ‘bulky’ legs, it’s time to change your tune. The quick rotations will leave your thighs and calves lean and sculpted.