Please choose the correct ending to complete the given sentence: Health: [header] How to do shoulder exercises in yoga [title] Try some simple breathing exercises first. [step] This pose will help you exercise shoulder muscles you don't use often and will prepare you for higher-intensity workouts later. [substeps] Lie flat on your stomach with your arms at your sides.

Ending1: Rest the palms of your hands on the mat so that they are aligned with your chest, and then slowly slide them back until your elbows are pointing upward. Push with your hands to lift your torso up and forward until your hips are off the ground. Ending2: Take one bent knee and bring it up towards your chest. Inhale and hold the position for two seconds. Ending3: Your back should be straight with your shoulders and pelvis tucked in. Take a small step forward, keeping the pose small. Ending4: Cross one knee in front of you and breathe in and out, using your diaphragm to take in and expel air. Start your exhalation at a low sigh, then slow down as you inhale.

Answer format: ending1/ending2/ending3/ending4