The aim of this study was to clarify the experience of recurrent/advanced cancer patients receiving outpatient cancer rehabilitation and evaluate true endpoints of cancer rehabilitation. The study was conducted by semi-structured interviews of 13 recurrent/advanced patients undergoing cancer rehabilitation during cancer chemotherapy. Six categories were extracted: [Finding the physical condition suitable for me] [Being unable to find movements that I can effectively utilize myself] [Being able to continue normal everyday life] [Showing people around me that I can still move] [Having fun actively moving my body] [Gives meaning to my present “living”]. Cancer rehabilitation is considered to give patients with recurrent/advanced cancer a chance to adapt to their present predicament by helping them re-establish the meaning, value, and objective of living. These results suggest that acquiring mastery can be a new endpoint of cancer rehabilitation.