Your best weapons in mini tennis are angles. In any racquet sport with a net, simple geometry dictates that as you get closer to the net, you can hit sharper angles. In mini tennis, every ball you get is a short one, so you can regularly pull your opponent well into and even beyond the doubles alley. In a good match, you'll end up running as much as you do in full-court tennis, if not more. In mini tennis the interval between strokes is shorter, so you end up running more constantly. I like to run my opponents from side to side, then hit behind them once in a while.