Lie on your back with your knees bent and feet flat on the floor. Be sure to keep your feet underneath your knees, not in front. Plant your palms on either side of you.
Raise your hips up to the ceiling, tensing your core and squeezing your butt as you do. You should be making a long diagonal line with your body, from shoulders to knees.
Hold for a few seconds, making sure your spine doesn't round and your hips don't sag. Keep your abs and butt muscles engaged.