Make a circle at the level of your head on the wall (with sidewalk chalk)
Make the circle about the same size as a basket.
Now stand 3 or 4 meters away from the circle.
Now throw the ball with your left against the wall and catch it with your right hand.
Do this for one minute.
The ball must not bounce on the ground.
If it is too easy, stand further away or try to throw the ball faster. If the exercise is too difficult, try to catch the ball with two hands, but still throw with one hand
Or stand a little closer to the wall. (Outdoors exercise)