It's one of the ones that sneaks up on you ....
A friend had lymphoma back in the mid 80s & I never appreciated just how nasty it was. He was put on a really savage course of chemo & took ages to get over it ..... we lived in a different town, so didn't 'see' what he was going thru - and he was always 'cheerful' in our communications - so I had NO IDEA it was as bad as it was.
I've always been almost embarrassed that I was so ignorant of his condition! :(
Off to one side of the article is one on Exercise during & after Cancer that also looks a good read!
http://www.abc.net.au/news/health/2018-08-16/exercise-cancer-care-physiotherapists-guide-to-fitness/10117906