Ball to a wall throw and catch on all fours

Start on your hands and knees facing a wall.
You can use a mat or towel under your hands and knees for comfort if needed.
You can also rest on your fists if this is more comfortable for you.
With one hand roll a ball to the wall and then catch it as it bounces back.
Repeat with your other hand.
Pushing the ball to the wall with each hand equals one repetition.