If you use tennis balls, put a slice in it or cut it in half to remove the air so you're not chasing it 40 yards down the trail. Good Luck ---- o o o ----- o o o ----o o - o -o -o- o- o o o o
To me, "sending" the target ball is the satisfying part of the fun! If I send the tennis ball 20-30 yards with a good shot, I have my next target already set up...Also, I fling the ball and let it bounce where it where it wants to randomize my practice. YMMV!