Inclusion Criteria:  Be an active participant in the BfitBwell Cancer Exercise Program Criteria for this program include: Adult (>= 18 years old) Being a patient seen at the University of Colorado Cancer Center Currently receiving cancer therapy or be within 6 months of completing cancer therapy Have a signed physician clearance form to participate in an exercise program Have a smartphone (necessary for the EMA assessments) A score of 48 or less on the FACIT-Fatigue (completed during the initial BfitBwell Program assessment) The minimally important difference of the FACIT-Fatigue is 3 points, suggesting that a score of at most 48 indicates the presence of CRF and allows for meaningful change in both directions.  Exclusion Criteria:  None