DOUBLE OBLIQUE CRUNCH
Lie with your back on the floor, hands behind your head and legs lifted so your shins are parallel to the floor. Exhale as you crunch your knees in towards your right shoulder. Lower and repeat by alternating left and right for 20 to 30 repetitions.
Sit with your legs straight and place your forearms on the floor beside you. Lean back slightly and extend your legs until they form a 45-degree angle with the floor. Scissor your legs, alternating your right leg over your left and left over your right for 30 seconds. Repeat 15 to 20 times. For an added challenge raise your arms (see picture).