Barbell hack squats
Deficit bulgarian split squats
Do those after a medium volume / high intensity leg work out I guarantee you will either throw up, or cry. They are horrid, and I do both after squats.
Most of my squat sessions start off with a tonne of mobility work.
Then, 3-5 sets of progressing warm ups. Last warm up is around 50% 1RM.
Warm up sets are between 5-8 reps.
Then the main programmed lifts, 3-4 sets max, but high intensity, medium volume. Last set is the heaviest with AMRAP.
1x dropset to 50% 1RM AMRAP.
Then 4x8 Barbell hack squats (aim for around 50-60% 1RM of your squat). Your quads are close to bursting at the end.
Then 4x8 each leg of DBSS - these are relatively light 15-20kg in each hand, or you can use a barbell if you want. I honestly lose the will to live.
I finish the session with some heavy calf raises, not that there's any point as I have bitch calves.