CRUNCH TIME
These twice-a-week midsection moves work — anytime and anywhere — to effectively flatten the rectus abdominus muscles that lie south of your navel.

Lie on your back and bend both knees to your chest. Lift head off mat and grab left ankle with both hands, pulling that knee to the chest and upper torso off the floor.

Extend straight right leg in a 45-degree angle to the floor, and hold this position for two seconds. Switch leg positions, kicking left leg up and out and bringing right knee to your chest. Keep alternating for two minutes while occasionally checking your technique by sneaking glances down to your lower belly. Keep breathing and suck it in!