TARGETS: Abs, Core

EQUIPMENT: Bodyweight

Lie faceup on the floor with your arms straight above you and your lower back pressed into the floor. Bend your hips and knees 90 degrees.

Lower your right arm to the floor above your head. Pause, and then bring it back up to meet your other arm. Repeat with your left arm. Keep your legs, hips, and lower back still the entire time.