ABSTRACTThis paper makes a beginning in the comparison of real ads on source credibility in the context of the marketing of “fitness” related goods and services. While the results establish the greater credibility of celebrity endorsed ads vis à vis non-celebrity endorsed ads in the context of the test product, the authors nevertheless empirically substantiate that certain ad characteristics may have potential for use as screening items to aid in effecting choice between a celebrity and a non-celebrity endorser in other product/service contexts. Additional exploratory analyses and results are reported.