We can forgive a man for making a useful thing as long as he does not admire it. The only excuse for making a useless thing is that one admires it intensely.
For an athlete to function properly, he must be intent. There has to be a definite purpose and goal if you are to progress. If you are not intent about what you are doing, you aren't able to resist the temptation to do something else that might be more fun at the moment.