Pursuit of physical activity goals often requires modifying plans, but research on these flexible processes is limited. Cognitive flexibility may heighten one's likelihood of using flexible self-regulatory strategies (e.g., substitution), thereby increasing physical activity. This study used daily diary methodology to test the indirect effect of cognitive flexibility on physical activity via activity substitution. A sample of 128 college students (73% female, mean age 19.9) completed baseline measures and cognitive flexibility assessments, then logged physical activity daily for 2 weeks. Activity substitution was defined as adopting an alternate activity on a day another planned activity was unfulfilled. Controlling for baseline activity, intentions, and time, a multilevel mediation model revealed a significant indirect effect of cognitive flexibility on physical activity via activity substitution (b = 81.36, p = .041). Our results indicate that people with greater cognitive flexibility are more likely to use flexible self-regulation, leading to greater physical activity.

This study investigated whether positive and negative romantic partner social control attempts (persuasion and pressure, respectively) were related to approach-avoidance motives and exercise among young adults ( N = 98), using daily reports. Daily persuasion was linked to higher daily approach motives. At the person level, persuasion was associated with higher approach and avoidance motives in addition to more frequent, longer exercise. Pressure was associated with higher daily relationship stress, which was associated with higher daily avoidance motives. At the person level, pressure was related to less frequent, shorter exercise. Thus, romantic partners' social control use correlates with exercise motives and behavior.

Exercise procrastination (i.e. the voluntary delay of intended exercise) represents a novel, reasoned route to self-regulatory failure in physical activity. This study sought to develop and evaluate a scale to measure exercise procrastination and assess its relationship with self-reported physical activity. Two surveys were administered to community samples ( n = 270, 279). In both samples, the Procrastination in Exercise Scale was positively correlated with general procrastination and predicted lower physical activity after controlling for intentions and general procrastination. Exercise procrastination appears to be a common phenomenon, and better understanding its role in physical activity may lead to novel intervention approaches.