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comrades, instead of pushing your knees forward and hips back, push your knees UPWARD and hips back. to get the sense of it, go at the bottom position of a cossack, see where you knee is at, then raise it upwards, your hips will round in. push your hips back while keeping the knees at that modified position, you will have to tense the contract the muscles harder and press on the heel more if the form does not come easy. you might also have to inflate the belly and contract it to find the upright balance of the torso. hope it helps.