Who’s to say one human’s goals are better than another’s. There is room on the course for all kinds of runners*, and if everyone were fast then it would be too crowded for anyone to run their best race. Telling Fabiola that she should quit her 10K just because she walks a lot would be like telling Michael Phelps that he should quit swimming because he’s never going to win the Super Bowl. Michael Phelps would of course tell you that the Super Bowl isn’t his goal, and then put on his 23 gold necklaces and laugh at Tom Brady’s 5 tiny Super Bowl rings.