The concentric squat is a fancy way of referring to a reverse squat or a bottoms-up squat. Instead of starting in a standing position, you start from a squatting position and rise up. This is called a concentric squat because the primary targeted muscle, your quadriceps, begins away from your body. It is fully extended and shortens in length as you rise up.
Your quadriceps, the four-headed muscle running along the front of your thighs, benefits the most from the squat. The heads all begin at different places but insert together into your patella, or kneecap. They work together to help you straighten your knee. Three of the heads begin from your femur, but one head, your rectus femoris, starts from your pelvis. Because it stretches across your hip joint, this part of your quadriceps is also engaged when you bend your hip.
While your quadriceps are targeted the most during the concentric squat, other muscles also engage so you can complete this move. Your gluteus maximus, the largest muscle in your buttock, engages when you rise out of your squat by helping to straighten your hip joint. Your adductor magnus, a muscle on the back of your inner thigh, also helps with straightening your hip. Down in your calves, your soleus engages to flex your ankle as you lower back down into your squat.
Two more muscles are used during the concentric squat to help stabilize affected joints. These are dynamic muscles because they cross over two joints, meaning they have to work double duty. Your hamstrings, situated on the back of your thighs, stabilize your knee while you squat down and your hip while you rise up. Your gastrocnemius, the larger muscle in your calves, stabilizes both your knee and ankle joints while you lower down.
For the concentric squat, you want to begin in a squatting position, which has your thighs parallel with the ground. Your feet should be hip-width apart and your back should be straight. Make sure your knees are pointing in the same direction as your feet. Engage your core as you press back into your heels. Rise up by straightening both your knee and hip joint simultaneously until you are standing straight. Return to the starting position and repeat.
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