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People run on treadmills at a New York Sports Club on January 2, 2003 in Brooklyn, New York. - 

An array of gadgets will track your fitness program, tell you in great detail how many calories you're burning, and what your heart rate is. They can even give you a kick when you are falling short of your goals.

CNET executive editor Molly Wood, who has tried just about all of them, joins Marketplace's Mark Garrison to share her recommendations.

Follow Molly Wood at @mollywood