The purpose of this study is to examine the acute effects of exercise on cognitive flexibility and symptom reactivity. The main questions it aims to answer are: Does moderate intensity physical activity reduce subjective distress, compulsive urges, and intrusions- and increase cognitive flexibility- in adults with obsessive-compulsive disorder compared to low-intensity physical activity? Researchers will compare low- to moderate-intensity exercise to see if moderate physical activity increases cognitive flexibility and reduces symptom reactivity in adults with obsessive-compulsive disorder (OCD). Participants will: Complete self-report surveys, psychiatric interviews, and cognitive tasks. Be assigned to either a low- or moderate-intensity exercise condition and complete physical activity. Repeat cognitive and symptom measures following the exercise intervention.
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Cognitive flexibility will be assessed using a probabilistic reversal learning (PRL) task called the Lucky Picture Selection Game.
Timeframe: Cognitive flexibility will be initially measured on day 1. Follow-up administrations will be completed 7-10 days later after the exercise intervention during session 2.
Symptom reactivity will be assessed using the Braga Obsessive Compulsive Symptom Image Set (BOCI).
Timeframe: Symptom reactivity will be initially measured on day 1. Follow-up administrations will be completed 7-10 days later after the exercise intervention during session 2.
Exercise intensity will be measured using a PolarTech chest-strap HR monitor.
Timeframe: Exercise intensity will be measured during 7-10 days after baseline, during session 2.