Take the air! People can control their breathing when they wish. When you feel some negative sensations or you feel tired, worried or afraid, just pay attention on your breath. Close your eyes and just breathe, deep and calm. Every exhale is relief. It sounds very easy but it is not such easy to stop thoughts. Our mind always wanders. We need to stop our thoughts and focus on breathing. Good exercise is count, when you inhale count to 5 and when you exhale count to 5. Repeat this exercise a few minutes. Stay in the present moment and allow yourself to feel relief. Everybody can do that. Just breath.