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We need to clarify some terms. "Extension" means movement of a joint which increases the angle between two body parts. So elbow extension is the movement that increases the angle between the humerus and radius/ulna, i.e. straightening the elbow. The opposite of extension is "flexion", which is a movement of a joint which decreases the ...


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An efficient squatter mainly uses the glutes to extend the hips, not the hamstrings. As can be seen from this image the hamstrings crosses both the hip and knee joint: They therefore have two functions: extending the hips and flexing the knee. If you use the hamstrings to extend the hips in the squat you also get a flexing torque at the knee. This means ...


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All resistance exercise involves forces being applied to the body in two distinct positions, with the forces acting in opposite directions. In any standing weighted exercise (squat, overhead pressing, deadlifts, etc), there is a downward force applied to the body by the weight, and an opposing upward force applied to the soles of the feet by the floor. It's ...


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Your posture is fine, but you could probably still work on maintaining a more neutral spine if that's important to you It looks like you have mild lumbar flexion when you squat, meaning that your lower back is being pulled into a flat position, rather than a neutral position (being slightly curved inwards). Since this is a body-weight squat, there's no ...


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