Rein Chemical

1) Knee Cross Crunch

This move is going to work every muscle in your stomach. To perform this move: Stand with your feet shoulder-width apart and hold a dumbbell in one hand. Extend the arm with your dumbbell over head and put your other hand on your hip for balance. Now lower the arm that was in the air as you simultaneously bring the opposite knee up across the body so that your elbow and your knee meet. Hold this position for about a second and perform the desired number of reps. When done with one side, complete the same thing on the other side.

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It's important to make sure you are getting your knee above the hips during this move. This is what is going to target your lower abs. (The dumbbell is optional. If you are just starting out, you can perform this move only using your bodyweight.)

2) Standing Bicycle Crunch

Think you need to perform bicycle crunches on a mat? Think again. This move works the same muscles that the bicycle crunch does -- all of them.

To perform this move: Stand with your feet hip-width apart. Place your hands behind your head with your elbows out and back in line with your shoulders. Bend one knee up across the body making sure it comes at least to hip height. Keeping the knee in the air, bend the opposite side of your upper body toward the lifted knee so that you can feel the crunch. Return back to the starting position and perform the desired number of reps, alternating sides. After you do this move, you may never do bicycle crunches on the floor again.

3) The Repeater

This move, derived from a step aerobics class, awesome because not only is it a killer ab exercises but it also provides a bit of a cardio and leg workout. Since this move is used mostly in a step class, you can use a step if you'd like but it's not necessary. It's just as good a move on the flat floor.

To perform this move: Stand with...