Ping pong is a wonderful sport to learn and play. In order to play it on a real table, you are going to need an opponent or a ping pong robot. Pingar is an augmented reality table tennis app that lets you play it against a virtual opponent anywhere. You can set the table anywhere in your view. You can use your phone or tablet as paddle, so you will get a good workout as you play the game.
Pingar has single player and multi-player mode. You can challenge a friend anywhere to have fun but there is always an AI opponent available. Jan Svensson is the developer behind this app. More information is available here.