Anchored Leg Raises
Leg raises work the rectus abdominis, a.k.a. the six-pack muscles, and the slower you go, the more you'll feel the burn. Lie on your back in front of your chair. Lift your arms overhead and grab hold of the chair’s front legs. (You can weigh down a lightweight chair with a stack of books or other heavy object.) With a flat back, lift your legs so that they’re perpendicular to the floor. Count to 10 as you slowly lower them to the starting position. Keep your core braced to protect your lower back.
Complete three sets of 10 leg raises.