Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to exercise for great buttocks [title] Try traditional squats. [step] Squats are one of the most popular exercises for working out the butt muscles. To do a traditional squat, simply stand up straight with your feet hip-distance apart.

Ending1: Squat at a 90 degree angle and lift your palms off the floor. Your heels should be on the floor around your hips. Ending2: Raise your left foot and tap your heel on the floor. Hold for 5 seconds, slowly then lower your foot and repeat with your right side. Ending3: Then, bend your knees so they're at a 90-angle and keep your knees lined up with your feet. Your butt should come close to being parallel to the floor. Ending4: Squat down past your toes and lower your buttocks until your arms are extended as far as you can go without touching your toes. [substeps] While squatting, do your best to keep your abs engaged.

Answer format: ending1/ending2/ending3/ending4