At the bottom position to the ascent phase, the demand shifts between different muscle groups—the squat transitions from the knee to hip extensors, specifically the gluteus maximus. However, the increased muscle activity in the gluteus does not impact or assist the other hip extensors through the sticking point region.
Research indicates that the glute muscles are at a mechanical disadvantage in the bottom position of the squat and are, therefore, unable to compensate for the diminishing contribution from the quadriceps adequately. As a result, the adductor magnus becomes the primary hip extensor muscle in the deep squat. This is one of the reasons why it is not uncommon to observe knee valgus under heavy loads, putting the lifter in an advantageous position to utilize the adductor magnus. Trained lifters tend to adopt lifting techniques that align with their mechanical advantage.
Overcoming the sticking region requires patience, persistence, and an intelligent approach to training. ...
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