This type of faulty reasoning also frequently takes the form of affirming the consequent: https://en.wikipedia.org/wiki/Affirming_the_consequent

(P→Q,Q)→P

It happens often when people have a limited consideration set of possible causes, often due to a natural degree of ignorance or lack of experience relating to the subject matter area, e.g., a small child sees a wet sidewalk and assumes it rained, because they aren't yet aware of sprinklers (or garden hoses, etc.)

(If rain→wet sidewalk, wet sidewalk)→rain

The title alone might be clumsily restated as:

(If amateur endurance athlete→rich, rich)→amateur endurance athlete