Deliberate exercise or display of the body is a prostitution

"I have wished myself to know that any deliberate exercise or display of the body is a prostitution; our created shapes being only our accidents until by taking pleasure or pains in them we make them our fault."

T. E. Lawrence, The Mint

That's a little extreme. And if you feel that way about your body, isn't your intellect also an accident?

Then on the other hand, what's wrong with prostitution?