What causes it? This guy I train with just cant stop himself leanng forward on squats and lunges, he does box squats right now because with normal squats he literally ends up doing a GM. The bar isnt too high its like a high bar squat but no higher than his traps. He cant do low bar squats as his rear delts and upper bar muscles are so under developed the bar just falls off.
Is it a weak posterior chain that cant hold him upright? And if so would doing hamstring and lower back work help? Or is it just a matter of practice?
Is it a weak posterior chain that cant hold him upright? And if so would doing hamstring and lower back work help? Or is it just a matter of practice?

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