Conclusion: Experts in sports think differently than novices, and are higher in their use of both knowledge and intuition. This study evaluated the effects of social facilitation and competiveness on exercise behavior among older adults participating in the Cybercycle Study. Social facilitation is defined as an increase in response due to the presence of others (Allport, 1924) . Several theories, such as the Self-Determination Theory (SDT) and the Cognitive Evaluation Theory (CET), have been developed to explain exercise behavior and the influences of intrinsic motivation on performance (Fredrick & Ryan, 1995) . Some studies have suggested that competitive environments fostered by social facilitation enhance performance on motor tasks (Zajonc, 1965) . It was hypothesized that a personality factor, such as competitiveness could influence the effect of social presence. Thirteen older adults (age=78.6) participating in the Cybercycle Study (a randomized clinical trial investigating the neuropsychological, physiological, and behavioral effects of a videogame-enhanced stationary bike) were assigned to ride an exergaming bike while competing against virtual riders. Participant performances during one month (frequency and intensity of rides) were compared with the previous month's performances when no other avatars had been present. Results show that with the introduction of on-screen riders, as competitiveness increased, ride frequency decreased (r= −.67; p=.01), while riding intensity increased (r=.55; p=.05). Social facilitation appears to interact with an exerciser's level of competitiveness such that it could enhance or detract from exercise goals, depending on the desired outcomes. This finding has interesting implications for prescribing various types of exercise according to personality style and desired exercise goals. Introduction: Data available in the literature show that children in daycare centres spend most of their time in sedentary activities that could have an incidence on their health. To the best of our knowledge, this is the first study to use a combination of theoretical frameworks (theory of planned behaviour, theory of interpersonal behaviour, process model on ease of retrieval) to identify psychosocial factors underlying the intention of daycare workers to make children aged 3 to 5 years move. It is important to study intention, because findings of meta-analyses indicate that this variable is the best determinant of behaviour.