I've heard various things (twisting the remote as you're hitting the ball), but I can't get it down with any consistentcy. My strategy is to use my back guy to do long, fast, across court smashes, then use the front guy to switch directions back and forth. I also do early hits in order to hit the ball almost parallel to the net causing the back AI to dive for the ball, then just slam it across the court the opposite way between the front and back AI. I've also found that when playing against anyone, that if you try to hit it right for the person's feet, they will often fumble and miss the ball completely.