Lie on your back on a flat bench placed in the middle of a Smith machine. Place your feet on the bottom of the bar and roll the bar to unlatch the safety hook. Extend your legs straight up while supporting the bar with the soles of your feet. Your body should form an "L" in this position. Hold onto the bench or onto the sides of the Smith machine and use your lower abs to lift your legs straight up as high as you can go. Hold the top position for a second and then slowly lower your legs back down until your glutes are back on the bench.

