It brings back some of the good old days off training, prior to a good friend of mine passing away from heart attack... we would warm up with two sets of light extensions, then we wouldcrush our legs... 4-5 set at 10-15 reps. ( start at 800lb for a good warm up andd end up with 1500lb on the press). We would then go right into hack squats(6plates to start, up to 8plates). With the heavy negatives we employed bracing our knees to the chest with our crossed arms.
Finally, do our bb squats, heels close together( no more than a shoulder width apart).
Keep up the hard work, or switch to palates something you can handle
RIP- Mr. S. Broadway. You will be missed