Running in Nairobi is much like life for the average Kenyan. There are obstacles and risks with every step. Not having sidewalks presents the continuous task of avoiding gaping holes in the black top or feeling the brush of a exhaust spewing vehicle as it passes dangerously close. At roughly a mile above sea level the air contains depleted oxygen levels causing the pulmonary system to labor more intensely. With each exchange the blood is less oxygen enriched then running at lower altitudes.