What do Jenny McCarthy, Ben Stiller and Ellen DeGeneres all have in common? Sure, they make us laugh, but they've all used Bob Harper to motivate and train them.

You can see Bob Harper on NBC's The Biggest Loser and get his great health advice by signing up for The Biggest Loser Club. By following his tips, you'll not only lose weight, but feel inspired as you watch your body transform.

Finding a trainer to the stars can be both difficult and expensive (especially when...

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Elliptical machines are here to stay. People with bad knees love them, as they allow a good aerobic workout without any pounding on the knees. The technique seems awkward at first, but can be learned fairly easily. Beginners can take it easy, and advanced aerobic exercisers can use a combination of incline and resistance to work as hard as they want. If you buy an elliptical for home use, be careful to find one that´s well made, since the cheaper models may not hold up.

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