This document discusses lessons that can be learned from roller derby and applied to agile practices. It notes that roller derby involves skating in a team sport around a track while passing a ball and blocking opponents. The document compares agile practices to the phases of learning in roller derby, from cognitive to autonomous skills. It outlines lessons like delivering fast and often, prioritizing by business value, eliminating waste, and emphasizing team empowerment and collective responsibility that can be taken from roller derby's 90 day challenges to improve agile methods.