Leg press allows a lifter to work the lower body when the lower back is tired and needs rest. The leg press is a weight training exercise in which the individual pushes a weight or resistance away from them using their legs. The term leg press also refers to the apparatus used to perform this exercise. The leg press can be used to evaluate an athlete’s overall lower body strength (from knee joint to hip).
As shown in the anatomoy of leg press, the exercise works the following muscle groups: Quadriceps, Hamstring, Gluteus maximus, Calves (partially).
Varying the angle between the sled and the backrest and/or the position of the feet on the plate puts more emphasis on one or the other muscle group.
If your new to leg press, progress slowly with weight increases. Lowering the weight to extreme low positions requires flexibility, as injury can result from premature range of motion excesses.
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Watch the Eva Andressa from Generation Iron Fitness do proper leg press: