Furthermore, the results indicate a relevant relationship between personality traits and motivation. Specifically, exercise frequency seems to be positively predicted from high levels of Extraversion/Energy and lower Agreeableness/Friendliness traits, and this influence seems to be more effective when the motivational regulation factor was introduced into the model. The significant contribution that motivational regulation gives to predict exercise frequency is evidenced by the negative prediction of external regulation and the positive prediction of identified regulation and intrinsic motivation on exercise frequency.