Instructions
Attach ankle straps to each ankle, with the metal hooks facing away from the foot. Sit on the edge of a bench or high box facing away from the cable machine. Attach both ankle straps to the cable attachment. Hold on to the bench, brace your core and extend your knees. Once the knees are fully extended, slowly return to the start position and repeat for the desired number of repetitions.
Tips
The taller you are the higher the bench or box will need to be. A way to do this is to place the bench on large bumper plates.