Please choose the correct ending to complete the given sentence: Health: [header] How to sleep in zen relaxation [title] Focus on contracting and relaxing each muscle. [step] One way to do this is through progressive muscle relaxation. In order to do this, you focus on a muscle and contract it for about 5 seconds and then allow it to relax for 10 seconds.

Ending1: While there is no one right sequence of muscles, most either go from head to toe or vice versa. [title] Notice your thoughts and let them go. Ending2: [substeps] To do this technique, tense and release the muscle and then release the other muscle. Repeat this for 10 seconds to 5 minutes and keep your relaxation times constant. Ending3: You can do any of the following to enhance the relaxation process : [substeps] Focusing on your breath, breathing deeply, relaxing your body from your stomach to your chest, and finally your feet. Tensing and relaxing your muscles as you inhale and exhale. Ending4: [substeps] Studies show that progressive muscle relaxation can be done with diaphragm exercises. On a diaphragm, tense and release the muscle for 3 seconds.

Answer format: ending1/ending2/ending3/ending4