This move works your abs, and tones your upper, mid, and lower back.

-Quadraped: Come down to all fours. Keeping your abs engaged, slowly raise your left arm forward to shoulder height and lift your right leg straight behind you to hip height. Hold there for 2 or 3 counts. Then lower back down and do the other side, right arm, left leg. Complete the set with 8 to 12 reps on each side. Keep your abs pulled in throughout this exercise. This move works your abs as well as your upper, lower, and mid-back.