Take a deep breath. Deeper. Use your diaphragm. The feeling of air....life.... filling your lungs is refreshing. The average American person doesn't use their full lung capacity. We have our bodies under so much stress and most of us don't sleep properly, that our breathe isn't as refreshing and life giving as it should be.
So stop every now and then and breath. Allow your body to be revived with the simplest of ways God has given us to have life.