In a seated position, throw a ball up in the air in front of you and catch it. Ensure you are catching two handed or with your affected arm. Try to control the pace and direction of the throw to keep it close enough to catch. Tip: To make the exercise harder try using a smaller ball or catching one handed.
Position yourself standing up. Practice throwing and catching a ball with both hands.
Standing with your feet shoulder width apart stand with your eyes closed. Gradually try to increase the time to which you can tolerate without having to adjust your feet.
Standing with your feet shoulder width apart on an unstable surface (Cushion, wobble board). Gradually try to increase the time to which you can tolerate without having to adjust your feet. Try to imagine a glass resting on the cushion / wobble board, you are aiming to keep your weight evenly spread so a glass wouldn’t fall over.
Standing with your feet shoulder width apart on an unstable surface (Cushion, wobble board) stand with your eyes closed. Gradually try to increase the time to which you can tolerate without having to adjust your feet.
For this you need to find a high chair, or bed that allows you to sit “perched” on the edge. The idea is that you are in a position that is in-between sitting and standing. This makes standing up easier. Set your self a target of how many of these you want to do in a row and when you are finding it easy you might progress to STS from a normal height chair.
Stand next to a kitchen counter. Hover your hands over the counter, and shift your weight on to your affected leg. Maintain this single leg pose for as long as possible, without use of your hands for balance.