system
Given the following post, respond as if you're commenting on Reddit:
human
CMV:Bodybuilding isn't a real sport the same as custom car or motorbike or PC building isn't a real sport.

As painful as this might be for some please follow my logic before downvoting.
Bodybuilding has a few objective goals which as easy as they are to state will always be judged subjectively by judges, participants and fans.
These goals include 
-building muscle mass on the participants body to be larger than genetics would ordinarily dictate without training. 
-this growth should be full throughout the body and propotional to typical anatomical models
-For competition purposes the competitor should be the lowest body fat possible for the sake of muscle definition and perceived "hardness".
-competition showcase would be inclusive of posing on stage to give the competitor the maximum advantage.

These are the fundamentals and you'll notice everything is quite subjective. The judges score what they see, that is all. They probably could be more objective and include dexa scans, blood tests but as bodybuilding is a showcase, not a sport they don't. 

This is similar to other showcase events including automotive, computer and fashion/ beauty because competitors although required to meet internal standards such as drug testing or( sometimes not) are generally not constrained as to HOW they achieve their specific look where as looking at something like weightlifting, you have specific criteria to meet in each movement as you perform and failure to meet these criteria even with a broomstick is a failed lift.

Futher proof of bodybuildings showcase classification is the contention and debate that every Olympia or any other major competion brings about unless conclusively won in indisputable fashion. The best example is the 1980 Mr. Olympia competion held in Sydney Australia. 

No other sport has such an open ended conversation regarding the result. 

There it is. Change my veiw.
gpt
I challenge your view that judge decided competitions are not sports. Many classical sports are decided by a panel of judges. Gymnastics, synchronized swimming, and diving, are all Olympic sports that are decided by judges. 

From the outside, the layman can't really tell what the difference between at 9.8 or 10.0 vault is, but the judges can. The same can be said for bodybuilding. There are certain muscles that can be difficult to develop and these are noticed by the judges. These small details separate the losers and the winners. 

Bodybuilders are also in a league with other athletes in their commitment to their competition. World champions spend every day at the gym and eat a specialized diet. This is not unlike Olympic swimmer Michael Phelps or basically any other world class athletes. 

I will concede that bodybuilders are not competing in the sense that they perform some incredible feat. However, having physiques like they do is an incredible achievement and could be considered an incredible achievement.