​​ While it is well established that the worldwide pandemic of overweight and obesity has profound effects on promoting cancer, it is now recognized that an alternative aspect of energy balance, namely physical activity and exercise have significant beneficial effects on all aspects of cancer across the spectrum from prevention through treatment and extending through survivorship. Moreover, salutary effects of physical activity and exercise extend across the age span from youth to old age and occur at all stages of cancer extending into palliative care. While the effect of...