It could by about any of those things and my position would be the same -- they are not sports. Any of them could be performed by a morbidly obese person who none of us could, in good faith, call an athlete.
"Athlete; a person trained to compete in sports"
Physical fitness has nothing to do with whether or not a person is defined as an athlete.
So to you, someone who is morbidly obese could qualify as an athlete?
As long as they are participating meaningfully in a 'sport'.
All sports may be physical but that doesn't make athlete a singular physical title.
"Morbidly obese. I'm talking John Pinette -- not Tommy Lasorda"
Suppose being obese was a sport (I know I'm just being silly), physical fitness aside that would make John Pinette an athlete by definition.
George Foreman among a lot of other heavy weight boxers (Butterbean). Other athletes would include some of the wrestles of old. There are a number of other sports where rather weighty people have competed at the highest levels, John Daly in golf along with a number of others. Sumo wrestling, it is a requirement. Shooting is another where morbidly obese people can and do compete.