There is a physical (and mental) decline in our bodies as we age—and studies have shown that biologic aging begins in our 20’s! Add cancer and the effects of its treatments to this decline and we can end up with significant weaknesses.
It can be extremely challenging to do any exercise or fitness program during treatment and even after treatment is completed. I remember some days, just getting out of bed was a major accomplishment. There is pain and limited abilities that may be secondary to surgeries and radiation.