A group of bikers are closely packed together during a race on city streets .
A group of hikers are closely packed together during a race on wooded trails .
A group of bikers are closely packed together during a race on city streets.
A group of hikers are closely packed together during a race on wooded trails.
Bikers ride on city streets while hikers walk through nature.
Bikers ride on city streets while hikers walk through nature .