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iVillage.com: Most Dangerous Exercise Machines at the Gym

Leg Extension Machine (Legs, Quads)

This seated exercise puts all the weight resistance in front of your ankles. As you straighten your legs you push the weight up. "This puts extraordinary stress on your knees," says Ramirez. "If you use too much weight, it can result in a torn meniscus (cartilage) or ACL (one of the four major ligaments of the knee).

Safer pick: Campfire squats

These work the same muscles without the knee stress. Stand with toes pointed out to 10 and 2 o'clock. Bring elbows between your knees and hands together in a prayer position. Straighten your legs, lift your butt up towards the ceiling, and bring it back down. Repeat 20 times.

(CREDIT: Hola Images/Getty Images)
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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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