Spikeball is a super-trendy, fast-paced game that combines elements of volleyball and four-square. Instead of hitting a large ball over a straight net, you're smacking a softer, grapefruit-size ball onto a bouncy, ringed one, sort of like tetherball but without the string. This is a physical game, one that requires fast movement and probably some diving if you want to score points. It's a great way to get teens off their screens and outdoors.