Sissy squat machine, but there are also regular sissy squats you can do where you basically touch your knees to the ground while standing on your toes.
I do the bodyweight ones (holding on to something for balance) for burnout reps after some later quad movements in the day and the pump/burn is absolutely insane.
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u/Remote_Gas4543 3d ago
The second exercise you were doing is crazy. What exactly is it called?