This article is not available online as a final peer reviewed draft until September 2007. You may contact the author for a personal copy to be sent to you. Dr Costas Karageorghis costas.karageorghis@brunel.ac.uk Publisher: Australian Psychological Society Pre-print: author can archive pre-print (ie pre-refereeing) Post-print: subject to Restrictions below, author can archive post-print (ie final draft post-refereeing) Restrictions: 12 month embargo Conditions: On author or institutional server only Published source must be acknowledged