Comparison of Affect-based, Self-selected, and Traditional Exercise Prescriptions

The purpose of this study is to determine if an "affect-based" or "choice-based" exercise prescription is more effective for behavior change than a traditional, "moderate-intensity" exercise prescription. Prior research suggests that "choice-based" or "self-selected" exercise intensity is more pleasant and adhered to than "moderate-intensity exercise" (Williams et al., 2014). Similarly, affect-based exercise prescriptions (i.e., an exercise prescription where intensity is regulated based on the pleasure-displeasure one feels while exercising) appear to have merit (Baldwin, Kangas, Denman, Smits, Yamada, & Otto, 2016).

However, choice-based and affect-based exercise prescriptions have not been compared to each other. Further, it is unknown if it is the intensity regulation that matters (e.g., "choose an intensity that feels good" or the focus on affect (e.g., "focus on feeling good). Third, prior research has not objectively measured physical activity behavior.

Inclusion criteria

• Must be fluent in English
• Must be able to walk
• Exercise less than 90 minutes per week at a moderate-intensity
• Must be able to attend laboratory visits
• Must have mobile internet accent and a personal smartphone (iPhone iOS 9+ or Android OS 4.3+)
• Can safely exercise at an intensity that is at least "moderate"

Exclusion criteria

• People who are recommended to have medical clearance prior to exercising, according to the American College of Sports Medicine's preparticipation screening criteria, will be excluded