it`s better (for me) run a mile, treadmill are the easy way... i can do 10 mins at fast speed with a very "normal" breathing and running in the street i do it a moderated and my breathing is not normal... the street remeber have irregularities some inclinations, and other natural or human factors that make running a different thing... it is like spinning and cycling.... cycling you can feel the wind, not the smell of the partner or listen to a guy.. when you accomplish your goal, (running or cycling) you would feel better than stationary system "does"...