Individuals in the BfitBwell Cancer Exercise Program complete a FACIT-Fatigue questionnaire at their baseline assessment. This will be screened for all incoming BfitBwell participants and those meeting the inclusion criteria of a score of 48 or less will be approached for interest in participating. The primary research activities beyond recruitment, screening, and informed consent are the collection of EMA fatigue assessments via smartphone application and PA assessment via actigraphy.

Severity of fatigue experienced over the course of the day, ranked 0-10. How would you rate your fatigue, over the last day, on a scale of 0-10, with 0 being no fatigue and 10 being the worst possible fatigue?

PA will be monitored using commonly used, non-invasive Actigraph devices (Actigraph GT3XP). Data will be collected utilizing methodology similar to that of the National Health and Nutrition Examination Survey (NHANES), in cancer survivors. The collected accelerometry data will be downloaded and analyzed in ActiLife software, calculation the average time spent in moderate-to-vigorous (MVPA) at each assessment period using standard algorithms and cut-points.

As all participants are recruited from active members of BfitBwell Cancer Exercise Program, additional data will be extracted from program documents which are regularly administered and collected by the BfitBwell Program. Administration/collection will not change for study participants. Physical assessment measures are obtained from a physical assessment and electronic questionnaire.

Measures of fatigue are collected electronically. Tools utilized to collect these outcomes: REDCap and the LifeData smartphone application.

• REDCap: REDCap is a secure, university supported and approved data collection tool. Links to complete the standardized questionnaires of fatigue (FACIT-Fatigue and MFI) will be emailed to participants with regular reminder emails sent daily until completed.
• LifeData: LifeData is a secure research platform used by previous research studies involving EMA (https://www.lifedatacorp.com/customer-publications/). The application will send a smartphone notification to collect data at random timepoints in predefined windows, and allow participants to self-initiate data entry. Participants will not enter any identifying information and will instead be assigned a de-identified research IDd. Linking documentation of participant to this ID will be stored solely on university servers. LifeData will be utilized to collect the EMA assessments of fatigue.