I find it hard to call lifting weights in a gym a sport, or bodybuilding which combines meticulous eating habits with weight lifting. I would consider darts or bowling a sport over trying to build your muscles bigger. Competitive bodybuilding is more of a sport because you're actually competing but it's not as if the winner is faster, stronger or more talented. The competitor wins based on more muscle which is a result of genetics, drugs, and how hard they dieted, and not as much, how hard they trained