Sit toward the end of your mat with your heels on the sliders. Bend your knees in halfway and extend your arms out long in front of your chest, parallel to your thighs. Lean your chest back so your shoulders are right behind your hips, with a straight spine and your core engaged.
On a slow 4-count, lean back while simultaneously straightening your legs. Stop when you feel like your heels will come off the floor.
On a slow 4-count, lift your torso back up as you bend your knees. Keep your shoulders behind your hips the whole time, so you keep tension in your abs.