Attach the rope handle to a high pulley a kneel down facing the machine with your buttocks near your heels abut not resting on them. Holding the ropes at the sides of your head, crunch your rib cage toward your pelvis without moving any other part of your body. Pause when your elbows touch your knees, ten slowly return the weight to the starting position. You can also crunch down bringing one elbow to the opposite knee to involve the obliques more.
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Attach a rope handle to a high pulley and stand with your back to the pulley with your neck between the ropes. Holding the handle to your chest, bend forward at the waist, rounding your back, and aim your chest toward your pelvis. Hold the contracted position for a second, then raise the weight back up and repeat.
A much more advanced version of the Barbell Rollout. This time start on your feet instead of your knees and follow the same instructions as above.
Grab a pair of dumbbells and position yourself as if to do a set of pushups with your feet slightly wider than shoulder-width apart. Keeping your lower back flat and abs braced tight, row one dumbbell up by drawing your elbow past your torso, as you support your body weight on the other side. Pause at the top for a second, then lower and repeat with the other side. Try to keep your hips as still as possible the entire time you're rowing.
Kneel on the ground holding a barbell with two small plates on the end of it with a shoulder-width grip. Keeping your back flat, allow the bar to roll out in front of you as you extend your arms and torso to follow it. Go out as far as you can without arching your back, then use your abdominals to drag the bar back to the starting position.