Mediators of Physical Activity Outcomes in a Peer-Led Intervention for Breast Cancer Survivors.

PA Plus RTR increased self-reported and objectively measured PA by changing theoretical constructs hypothesized to be associated with behavior change. Peers delivering a PA intervention should focus on increasing survivors' self-efficacy for exercise especially in challenging circumstances such as being on vacation, and also help to overcome disadvantages of exercise such as taking time away from family. This article is protected by copyright. All rights reserved.