I hope I worded the title correctly. What I'm looking for are exercises or 'games' for two players where neither acts as a coach for the other and both try to win. It shouldn't involve a serve as I'm looking to fit in maximum amount of rally balls per time invested. It should differ from normal hitting in that it has some form of goal, and it shouldn't just be normal sets with underarm serves as there would hardly be any point in that. One exercise I came up with (not the first I'm sure) involves only getting points for winners. If you hit a clean winner you get 1 point, first to 10 points wins. If the other guy makes an error you get 0 points. Play is started by either guy putting a ball in play and the counting begins when it has cleared the net 3 times. What do you think, got any others?