Please choose the correct ending to complete the given sentence: Health: [header] How to align your shoulders [title] Strengthen your mid back. [step] Part of being able to pull back your shoulders and keep them properly aligned is having strong muscles in your mid back region between your shoulder blades. The main muscles groups there are called the paraspinals, rhomboids, trapezius and infraspinatus.

Ending1: The paraspinatus is behind the bra. You do not need to tuck away your bra yet. Ending2: These major muscle groups are located in the middle of the pelvic floor and run perpendicular to the floor for stability. They are divided by a rise and decline component. Ending3: This part of the body is great for pushing outward, which refers to the way the shoulder blades line up. [substeps] Move one side of your shoulders slightly inward, then lift it toward your shoulder as far as possible. Ending4: When these muscles are too weak, they allow the shoulders to slouch forward. When they're strong, it's easier to hold and maintain good posture.

Answer format: ending1/ending2/ending3/ending4