Slide board knee tucks are great for anyone looking for a challenging abdominal exercise. This movement requires a great deal of upper body strength. It is important to note that whenever the knees move toward the chest, the hip flexors (e.g. iliopsoas) are heavily involved.

Instructions:

Place both hands on the slide board ramp. Get into the push-up position with your body flat. Next, slide your feet toward the ramp. Your knees should bend and move toward your chest. Ideally, you should try to bring your feet all the way to the ramp. Keep your stomach tight and abs flexed during the exercise. Return to the starting position and repeat the movement for several repetitions.