Here are links to some videos that you may find helpful:

This is information for cancer related fatigue:
https://connect.mayoclinic.org/page/cancer-education-center/tab/reducing-fatigue/
This talks about physical activity and the benefits for all of us, especially cancer patients. Small doses are still advantageous to our health!
https://connect.mayoclinic.org/page/cancer-education-center/tab/physical-activity/
Hopefully this will be helpful to you!
Megan