philosophy for how to use one’s body is just as useful as a philosophy for how to live one’s life. All of us get only one chance to enjoy a good life, and we don’t want to die full of regret for having mislived it, and that includes having misused one’s body. By following deep and ancient instincts to avoid the discomfort that comes with physical exertion, we increase the chances we will senesce faster and die younger, and we become more vulnerable to many diseases and chronic, disabling
