Lie face up, hands behind head, elbows out. Lift shoulder blades and left leg about 6 inches off floor as you bring right knee toward chest and twist torso toward right knee. Make it harder: Hold a 3- to 6-pound medicine ball at chest (as shown). Switch sides, twisting torso to bent left knee for one rep. Continue alternating in a pedaling motion.
Target: ABS, OBLIQUES