6 Dangerous Exercises You Should Never Do

Photo by: Jessica Cassity

Knee Extension Machine
Every fitness center has at least one of these machines-you sit in a chair with the fronts of your ankles pressed against a weighted bar then extend the legs straight in front of you. But just because you can do it, doesn't mean you should. "This exercise makes your knees the victim of physics," says Howe. "Pressing the weighted bar at your ankle creates a lot of torque at your patello-femoral ... more 

Photo by: Jessica Cassity

Knee Extension Machine
Every fitness center has at least one of these machines-you sit in a chair with the fronts of your ankles pressed against a weighted bar then extend the legs straight in front of you. But just because you can do it, doesn't mean you should. "This exercise makes your knees the victim of physics," says Howe. "Pressing the weighted bar at your ankle creates a lot of torque at your patello-femoral joint, where your knee cap meets the long bone of your upper leg." Using a light weight may not cause as much of a problem, but to keep your knees truly pain free you'd be better off strengthening the quads in other ways, like stair climbing.

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