Throwing a ball from hand to hand (moving image habituation) in sitting

Sit on a chair with both feet flat on the floor.
Hold a ball in one hand and then throw it to the other hand.
Take some time between each throw to allow your symptoms to settle.
Try and build up how long you can tolerate this for.
Over time, try and reduce the time spent pausing between throws.
As you feel more confident, try throwing higher.