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April 16 2009 12:00 AM

Today's gym goers can be found singing on their stationary bikes during Cycle Karaoke, shaking their butts at Yoga Booty Ballet, sweating through a high-energy yoga flow class and learning the dance moves to Legally Blonde. They're moving in different ways with different rhythms, but they're all trying to get the heart rate up in an interesting, engaging way.

In short, they're doing aerobics.

More than 40 years after Dr. Kenneth Cooper released the book Aerobics, the form of exercise hasn't died. It's just morphed with the times, giving itself new names and shedding the leg warmers and the headbands.



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