This paper explores the relevance of sustainable development to physical ed
ucation and argues that it is a vitally important concept that presents the
opportunity for considerable theoretical and practical development. The im
plications of sustainability development for our understandings of physical
activity are examined with recognition of the significance of activity beh
aviors within sustainable living. In the context of education, the developm
ent of critical curriculum theory is advocated since the potential environm
ental crisis necessitates profound social change. Possible avenues for the
development of critical theory in physical education are identified, and ph
ysical education's possible use as a vehicle for the promotion of sustainab
le active living is considered. It is argued that such a focus would improv
e the subject's contribution toward both the promotion of active living and
social transformation for sustainability.