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Seated Leg Press (Works Legs, Glutes)

"It's one of the worst machines because it puts pressure on the knee joint and the entire low back," says Tim Ramirez, D.C., founder of in Costa Mesa, Calif. "Plus, most people put too much weight on it."

Safer pick: Stiff-legged deadlifts

They activate all the same muscles in the correct sequence with less risk, but they must be performed perfectly, says Ramirez. Stand with arms straight down, weighted body bar in front of your thighs. Engage the abdominals as you bend forward at the hips, keeping back straight and knees slightly bent. Do not round your back! Bend forward only as far as you can without losing your form and then slowly stand back up by pushing your heels into the ground. Repeat 10 to 12 times for two to three sets.

(CREDIT: Adrian Green/Photographer's Choice/Getty Images)
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