It can be a problem: people who are fat or whose bodies don’t fit a stereotype of an athlete don’t think they can be fit without changing their body. So they give up or focus on losing weight rather than trying to get fit. That’s too bad. Fitness leads to a better life, regardless of your age or sex or body size.
What I love about this piece is that it clearly shows there is no perfect body shape for an athlete and you can be fit and athletic regardless: The Body Shapes Of The World’s Best Athletes Compared Side By Side | Bored Panda
For more on this, I recommend you read this: In Obesity Research, Fatphobia Is Always the X Factor – Scientific American.
(Image from the Bored Panda site. I recommend you go through it. It is amazing to see just how different are the bodies of athletes in different sports.)