I am trying to start running. I live in the city. I see many people running on a sidewalk next to 4 lane street/avenue.
I could help but asking myself the question, is this running healthy given the exhaust fumes from all the cars? It's like putting your mouth on an exhaust pipe!
Still, the people who run on sidewalk are so numerous. Am I wrong for thinking this is unhealthy or are they wrong for running?
(I can't afford a treadmill or a gym membership).