bodybuilding belongs in a class all by itself. The sport (if you consider it one) is about discipline and slaving the body and mind. It is entirely different from other sports. Other sports are first and foremost based on talent and genetics, hands down. Without the two, you won't be playing baseball, soccer, basketball, football, etc in even the college level. There are a host of players that float through college and in some extreme cases, through pro leagues with talent alone. We see it all the time - you know, the guys who believe they ARE the team. The ones that don't participate well with others.
Bodybuilding, what makes bodybuilders often gravitate to it, is the fact that to be successful in it first and foremost you must have discipline and will. If we were to classify the talents of all the other athletics as compared to bodybuilding, I'd say that baseball - extreme eye/hand coordination, football - something similar + superior genetics for size and strength. Basketball - tall and excellent eye/hand coordination, soccer - extreme amounts of endurance.
The amazing aspect of bodybuilding is that even if you have the genetic gift, you still have to work your butt off, completely defy normal social practices, and find a level of discipline that typical athletes know nothing about. The genetics really determine whether you will be an Olympia winner or not - that's about it.
As far as posing, it is a skill. I have that one down but I still get my butt kicked at the end of the day...