This routine is an amalgamation of the exercises from both Vol.1 and Vol.2 of the Building a Better Runner Series. I tried to make sure that the anterior chain and posterior chain were equally challenged in this cool-down. You don't need any props (i.e. medicine balls, hurdles, etc.) and for the first couple of weeks you should think of this as circuit that is work and not a cool-down, yet after a couple of weeks it becomes really easy.