You may hold objects for them or anchor them down.
Left HandedPeople do not seem to pay any attention to which hand you use to demonstrate. If you are left handed, go ahead and demonstrate with your left hand. If they are left handed, ignore it.
Joint RestrictionsColouring is the easiest activity to modify by giving them a large crayon. Larger tiles can be made and follow the same designs for copying. The moving test can use a larger dowel stick.