Split and Tuck Lie faceup, with legs in a split and lifted about 6 inches off floor and hands placed lightly on back of head. Crunch up slightly (A). Bring legs together, then tuck knees into chest and crunch up more (B). Extend legs straight out and return to "A." Repeat 30 times. To really work your abs, try not to let your legs touch the floor.
Tracy Anderson's Top Tracy Anderson's Top Exercises for Flatter Abs and a Stronger Core: This seven-move series, created exclusively for Health readers by Tracy, is part of our 30-Day Core Challenge: Transform Your Butt, Back & Abs. It promises to do wonders for your waistline just in time for summer. #HEALTHxTA | Health.com