Everything is a tradeoff. About 10 to the 16 cell divisions occur in a typical lifespan so somewhere in cells that are part of you each of your genes has mutate

Everything is a tradeoff. About 10 to the 16 cell divisions occur in a typical lifespan so somewhere in cells that are part of you each of your genes has mutated 10 to the 10 times. Most mutations are neutral, some are beneficial and others can cause cancer. Any activity that makes you sweat is likely causing damage to your cells which now have to replace lost material by dividing at a higher rate, increasing your chances of cancer and other diseases. Source for the numbers: http://harpers.org/archive/2008/04/contagious-cancer/?single=1 http://harpers.org/archive/2008/04/contagious-cancer/?single...