It is commonly argued that a lifter should squat on the heels to activate the posterior chain. Although “heels” may be a useful overcue for a lifter who is too forward, any time the combined lifter/barbell center of mass is not vertical to the base of support, the lifter has to expend extra energy to remain in balance that could be better applied to lifting the bar. Additionally, if the lifter moves the combined center of mass by keeping a more upright back, the moment arm on the hip is reduced, reducing the involvement of the hip extensors, a key element of the “posterior chain.”