This logo is successful because it portrays the mission of the run/walk well. The type flows intricately as it wraps around the circle. One's eye is attracted to the pair of lungs in the center and then is brought out to read the text on the outside. The graphic designer uses repetition of the color blue which works well for this logo. The contrast between the two colors in the type adds interest visually to it, also. Overall, I like this logo because it is easy to follow and understand what the purpose of the run/walk is.

http://www.freetobreathe.com/materials