Exercise can apparently lessen the rate of cancer cell growth and even help prevent its recurrence.

Hey, maybe too much exercise causes cancer!!  I was a couch potato compared to the above.  I walked every day, wasn't much into exercise but I was hardly ever sitting.  Did a lot of crafts, recovered couches, played with grandkids, swam, canoed in summer etc and 8 days before diagnosed I built a small brick wall all by myself ...  from wo to go - with the cement mixer and all that stuff.  All in one day I might add.  Dug the hole, did the footings and then put on the bricks (not all meant to be done in oneday, maybe that's why its bit crooked.  That is how I used to handle stress.