Volleyball requires a lot of physical activity, which will strengthen your upper body, arms, and shoulders. These are the areas that get most of the action out on the court, so they need to be strong enough to handle all the wear-and-tear of the game. The more you play, the more your body will adapt to the demands of the sport. So yes, volleyball can make your arms and shoulders bigger. But only if you let it! The more you guard against muscle growth, the faster you'll reach your maximum potential size. If you want to keep your arms from getting bigger, then you should probably stop playing volleyball. The best way to keep your arms from getting bigger is by keeping them in good shape already. Workout regularly with weights or cardio machines to build muscle, and you'll find that your arms don't need to grow any larger than they already are. If you aren't used to working out, then start with a simple program of exercises that focus on whole bodies parts. For example, you could start with weight training three times a week, with each workout lasting about an hour.