Bodybuilding is a skill:
Main Entry: 2skill
Function: noun
Etymology: Middle English skil, from Old Norse, distinction, knowledge; probably akin to Old English scylian to separate, sciell shell -- more at SHELL
1 obsolete : CAUSE, REASON
2 a : the ability to use one's knowledge effectively and readily in execution or performance b : dexterity or coordination especially in the execution of learned physical tasks
3 : a learned power of doing something competently : a developed aptitude or ability <language skills>
synonym see ART