Are Squats a Hip-Dominant or Knee-Dominant Exercise?

Hips, knees and ankles work hard during a squat.
i JTPhoto/Brand X Pictures/Getty Images

You may associate squats with those Schwarzenegger-sized guys doing their thing near the barbell racks at the gym. But squats can be a Nestie’s best friend -- even if your hips or knees are problem areas. You’ll need to delve a bit into biomechanics to understand whether squats are hip or knee dominant -- but knowledge about this foundational exercise is worth gathering. “Let’s arm you with plenty of information on why you should squat,” advises trainer and fitness author Lori Incledon, “and why squatting may be one of the most important exercises you can do.”


    You can do squats with loaded barbells, an unweighted bar, dumbbells, kettlebells, resistance bands, a Smith machine or other weight machines -- or just with your own body weight, which is probably the best way to start. You want to flex your knees fully so you can drop your backside as low to the floor as possible. The quads, glutes and hamstrings, with help from the plantar flexors in the ankle, do much of the work to drop you down and help you rise back up.

Hips, Knees -- and Ankles

    Although it may seem that the knees are doing mountains of work along the way, generally the hips -- extended by the glutes and related muscles -- are actually dominant during the squat, creating the needed twisting forces, or torque. “Yes, hip/trunk extensor torques tend to be larger than knee extensors or plantar flexors in a standard squat,” notes Duane V. Knudson, a biomechanics professor at Texas State University. “This will usually be the case unless you have a machine or do unusual (front) squats with minimal trunk lean.” For regular squat exercises, the glutes experience greater turning force -- “net moments” in biomechanics-speak -- and are typically stronger than the quads, which extend the knee, Knudson notes.


    Different types of squats demand different contributions of the major players of the lower body: the glutes, quads and ankle flexors. The powerlifting squat, with the barbell low behind the shoulders, demands greater force from the hip joint, which is stronger than the knee joint, notes kinesthesiologist James Griffing of the exercise website The front squat -- barbell held atop the collarbone instead of the shoulders -- asks more of the knees, as does the sissy squat and lever barbell squat. The bodybuilding squat, with the barbell high on the shoulders, distributes torque evenly between knee and hip.


    Squats can be “one of the safest and most functional exercises you’ll ever perform,” notes Incledon in her book “Strength Training for Women.” Get a friend or workout buddy to give you feedback on your form, particularly making sure you don’t elevate too quickly and damage your knees. Because squats work so many large muscle groups and encourage joint flexibility, they encourage functional and sports-specific strength. If you’re an athletic Nestie, learn the split squat -- one leg forward, one back -- and the one-legged box squat as soon as you can. These have a good record in helping girls and women avoid anterior cruciate ligament injuries.

the nest