Are Weight Machines Better for Legs Than Lunges & Squats?

Squats, lunges, leg presses and hamstring curls all focus on developing the lower body. Though the exercises target the same muscle groups, there are differences in the movements involved and how they work the muscles. Machines are not necessarily better than lunges or squats, or vice versa. Your decision to go with one over the other on any given leg-workout day may depend more on what your goals are for your lower body and your workout in general.

  1. Compound Movements

    • Lunges and squats hit almost all the muscles of the lower body in a single movement and can cut back on workout time by reducing the number of exercises you need to perform to work all of these muscles. Lunges and squats are compound movements, meaning they involve more than one joint and more than one muscle group to perform the exercise. With the focus on the lower body, lunges and squats work your quadriceps, hamstrings, glutes, calves and lower back all in a single movement.

    Isolations

    • As opposed to compound movements, isolation exercises on weight machines are valuable for developing tone in a particular muscle group and are often useful for rehabilitating injured muscles or joints. Weight machine exercises like quad extensions and hamstring curls work a single muscle in isolation. Only one joint moves and a single muscle group is targeted. Quad extensions focus on the front of the upper leg, and hamstring curls target the muscles at the back of the upper leg. They can also help in correcting weak-side dominance — where one leg or joint is stronger than the other — by allowing you to perform exercises with one leg at a time.

    Hypertrophy

    • Weight machines like the leg press and the Smith machine are helpful when lifting heavier weights for muscle hypertrophy. Weight machines eliminate the instability of a barbell or your body weight and allow you to move heavier weight since you are less concerned about dropping a weight or losing your balance. Machines like the leg press also help with strength and hypertrophy gains by locking you into correct form and ensuring the proper joints and muscles do the work with less assistance or cheating from other parts of the body. Machines like the leg press also support your lower back better than free-standing exercises, thus allowing you to move more weight.

    Functional Strength

    • Squats and lunges imitate movements that you may perform during non-workout activities. Functional movements like squats and lunges not only build and tone muscle but also prepare your muscles and joints for similar actions in sports or everyday activities. Bending from the knees and lifting something heavy is much like performing a squat. Reaching from third base to catch a line drive in baseball or stopping your forward momentum to double back to the serving line in tennis both have you lunging without even thinking about it. Lunges and squats more accurately mimic movements you perform regularly and can help keep the body conditioned and ready for these movements.