Please choose the correct ending to complete the given sentence: Health: [header] How to quickly boost your energy with yoga [title] Get into position. [step] Sit or stand with your back straight and your hands at your sides to do basic deep breathing. If you're sitting in a chair, keep your back away from the back of the chair.

Ending1: If you're standing (push up) in a room with only enough light to get a sense of everything around you, this is your starting point. [title] Deep-breathing is an ancient chinese practice. Ending2: If you're standing, sit against a wall. Make sure you're pressed up against a wall so your shoulders and upper back (where your neck would be if you were sitting) are aligned directly below your shoulders. Ending3: [substeps] If you're standing in a wall or a step stool, sit on the edge of the chair with your legs curled forward. Your shoulders, arms, and hands should be vertical. Ending4: You should feel comfortable and able to relax. [substeps] Double breathing is the basis of many of the energizing exercises because it increases the oxygen in your blood.

Answer format: ending1/ending2/ending3/ending4