This is NOT a collapse downward, but
simply a bodyweight squat at a faster, but controlled, downward speed.
Not exact matches
Simply complete multiple sets of heavy rear - foot elevated split
squats in the 4 -8-rep range, wait 45 - 90 seconds after your final set, then dive into a
bodyweight challenge set.
By
simply working on your deep
bodyweight squat form, going as deep as you can with control and holding as long as you feel reasonably comfortable, you'll help address and improve those issues.