Intention. Intention was estimated by the total score on the responses to three different items: "I intend/ I will try/ I am determined to participate in the program of this gym three times a week during the next two months." Responses to the first item were rated on a 5-point "likely to unlikely" scale, while a scale with endpoints labeled "yes sure" to "not at all" was used for the other two items (Cronbach's α was .77). Attitude. Attitude toward behavior was assessed by the question "I think that participating in the program of this gym three times a week during the next two months is..." Responses were rated on 8 bipolar adjectives (eg., goodbad, useful-of no use, pleasant-unpleasant). Again 5-point scales were used. Cronbach's α for this scale was .82.