Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to do the pilates jackknife move [title] Lie down on your back on the pilates mat with your legs straight and together. [title] Keeping your arms right beside your body with your palms facing down, raise your legs up to a 90-degree angle without bending them. [title] Exhale as you lift your hips off of the mat and curl your abs in.

Ending1: [title] Hold for 10 seconds while keeping your abs vertical. [title] To lower your body back down, open your legs as much as possible, keeping your abs in. Ending2: [step] , with your stomach lifting that 90-degree angle and arching your back. If you've managed to hold it for a minute you will have come close to jacking off! [title] Breathe deeply as you lift your hips off the mat. Ending3: [step] Keep your torso where it is and keep your back flat on the mat. [title] While keeping your legs straight, raise your hips up to a 90-degree degree angle without bending them and curl your abs in. Ending4: [step] Keep maintaining the 90-degree angle of your hips and legs. You'll know when you've completed this step once your knees are directly above your nose and your legs are straightened parallel to the mat.

Answer format: ending1/ending2/ending3/ending4