Set up a “net” using a rope or ribbon between two chairs or by laying a ladder on its side. Have one person stand on either side of the net and using a racquet hit a balloon or a ball back and forth. Try to see how many times you can make the balloon go back and forth across the net without the balloon hitting the ground. If you are using a low-compression ball, the ball can bounce on each side of the net before hitting it back. You can challenge yourself to only touch the balloon 1-2 times before hitting it back to your partner.