Our experiment will recruit employees at a Fortune-500 company who wish to exercise more. Recruitment will be done through an email and poster campaign. The registration stage will take approximately four weeks. All employees at all offices with on-site gyms will be eligible to enroll and upon enrollment will be asked to select a partner who works in the same office and who is also enrolling. Enrolling employees will also be asked to indicate their preferred daily workout time (a two hour "workout window") and to provide basic demographic and exercise-related information (e.g., gender, age, height, weight, number of gym visits per week). If registration exceeds the target sample size (4,000 employees), priority for enrollment will be given to employees who do not already exercise regularly (at least twice a week). The remaining participants will be assigned to a "holdout control" condition. Once registration is closed, participants will be assigned randomly (at the pairs level) to one of the four experimental conditions.