On the recreation center where I live, the are these four big squares. One square has a line across one corner (forming a triangle and big enough for a person's feet). That one triangle inside the square was marked "pro square". My grands and I each took a square. We allow one bounce to pass the ball to whoever we wanted. If the ball bounced twice, whoever was in the prosquare had to give it up. We just moved around (thus each person had a chance in the prosquare). I don't have a lot of stamina, but I ended up playing for an hour.
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