An Exercise and Nutrition Monitoring Intervention (Pt Pal) for the Improvement of Strength in Patients With Pancreatic or Stomach Cancer Receiving Chemoradiation Therapy Before Surgery, SurgeryStrong Study

Inclusion Criteria:

* Pancreatic or gastric adenocarcinoma, biopsy-proven
* Have completed or are within 2 weeks of completion of preoperative chemoradiotherapy either on- or off-protocol
* Anticipated to undergo potentially curative resection in 4-6 weeks from enrollment
* Able to understand the description of the study and willing to participate
* Able to understand the exercise program
* Able to independently maintain daily exercise logs via Pt Pal -iOS, Android or desktop web browser on their own personal device
* Telephone or email access and agreement to engage with the research personnel via phone or email
* Meet all screening requirements, including physician clearance
* \>= age 18

Exclusion Criteria:

* Non-English speaking
* Has participated in moderate to high intensity strengthening exercises at least two times per week within the past four weeks prior to enrollment
* Unable to complete the baseline assessment questionnaires or functional assessments
* Underlying unstable cardiac or pulmonary disease or symptomatic cardiac disease (New York Heart Association functional class III or IV)
* Recent fracture or acute musculoskeletal injury that precludes the ability to weight bear fully on all 4 limbs in order to participate in an exercise intervention
* Numeric pain rating scale of \>= 7 out of 10
* Myopathic or rheumatologic disease that impacts physical function
* Recurrent cancer following prior resection
* \< age 18