Main Muscle Worked: Quadriceps
Other Muscles Worked: Hamstrings,Calves,Glutes
Mechanics Type: Compound
Tips: Position a barbell on the back of the shoulders and grasp bar to the sides. Put your feet at shoulder width with your toes and knees slightly pointed outwards. Descend until knees and hips are fully bent. Extend knees and hips until legs are straight. Return and repeat. Some people believe this is damaging to your knee, but others believe it is a great exercise. Can also be done with dumbbells in your hands instead or on the Smith machine.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.