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Total Gym reverse crunches are an advanced abs and core exercise.
Pay careful attention to form as, if you do them incorrectly they are a complete waste of your time.
Position your hands on the floor slightly wider than shoulder width and have your feet towards the bottom of the total gym bench.
Start from the plank position which is the same as the top of a push-up. Make sure to keep your torso parallel with the total gym bench for the duration of this movement.
From the plank position slowly bring your knees toward your chest, crunching your abdominals and posteriorly rotating your pelvis while you try to maintain a neutral alignment in your spine.
This is the key for proper form. You must contract your abdominals each and every rep or you are wasting your time with only hip flexion.

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