Final answer:
To modify the Long Back Stretch on the Reformer for a client with Thoracic Outlet Syndrome and symptoms in the right arm, they can perform the exercise in a seated position and avoid excessive extension and rotation of the arm.
Step-by-step explanation:
For a client with a history of Thoracic Outlet Syndrome experiencing numbness and tingling in the right arm, the Long Back Stretch on the Reformer should be modified to avoid exacerbating their symptoms.
To modify the exercise, the client can perform the stretch in a seated position to reduce the compression on the thoracic outlet area. Additionally, they should avoid excessive extension and rotation of the right arm during the stretch.
It is important to communicate with the client and monitor their symptoms during the modified exercise to ensure their safety and comfort.