Oh Boy, here we go again, 
DEFINITION:: a person who is trained or skilled in exercises, sports, or games requiring physical strength, agility, or stamina
okay but again, bodybuilders are trained or skilled in exercises that require physical strength (weightlifting). There is no way you can disagree with this statement.
And where exactly does the definition state that you have to be judged in one of the following things to be considered an athlete? If the definition would be something like,
a person that is
judged in an exercise, sport or games that requires physical strength, agility or stamina, then you would have a point. But nowhere it is stated that athlete has to fulfill the above stated during a competition or be judged in one of the above stated conditions. . It simple refers to the persons skills per se.
According to webster bb are athletes as they are skilled and trained in weightlifting. This skill is not used during the actual competition but only in preparation, but this is totally insignificant as this is not required to fulfill the definition of an athlete according to webster.