Write the next sentence in the following story.

How to sleep in zen relaxation
Focus on contracting and relaxing each muscle.
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.

i. While there is no one right sequence of muscles, most either go from head to toe or vice versa. Notice your thoughts and let them go.;
ii. 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.;
iii. You can do any of the following to enhance the relaxation process : 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.;
iv. Studies show that progressive muscle relaxation can be done with diaphragm exercises. On a diaphragm, tense and release the muscle for 3 seconds.;. The answer should be
i.