Answer:
Players need to make sure they are wearing shoes appropriate to the venue. For example if you're playing on a basketball court, don't come in wearing vans or boots/sketchers. A good idea is cross trainers, something that will support jumping, lateral movements and will allow grip for you to throw off of your planted foot.
Volleyball Knee pads are HIGHLY recommended as they will save your needs from unnecessary damage when accidentally contacting a hard surface.
Elbow pads, especially those that come weaved inside of a basketball shooter's sleeve are good for people that like to hit the floor a lot.
Shooter's sleeves can keep a thrower's arm dry.
Sweatbands are also good as you will work up a sweat and there is nothing more frustrating than throwing slippery balls.