FIT 505 SISSY SQUAT BU-A9LEG EXTENSIONS DONE PROPERLY: Think of this exercise as a mix of reverse knee extensions and hack squats. Works amazingly well to target all 4 heads of the quadriceps and glutes muscles, strengthen the knee and hip joints and trains your core balance and stabilization at the same time COMFORTABLE, HEAVILY PADDED CALF PROTECTION: Sissy squats can be performed free style as well, which is why they are also known as the Matrix squats! However, this