Running groups were pretty common in the US in the 70s, when running became mainstream. Then it seemed to become more of a solitary activity, outside of organiz

Running groups were pretty common in the US in the 70s, when running became mainstream. Then it seemed to become more of a solitary activity, outside of organized events. https://en.wikipedia.org/wiki/Running_boom_of_the_1970s https://en.wikipedia.org/wiki/Running_boom_of_the_1970s