theses are some excercises:
standing without support for 30 seconds
raising from sitting to standing with arms folded
standing with looking to ceail above head level, then look behing shoulder level
walking first between parllel bar, then with one hand support on the bar then with no hand support, then make the excercise differecult by adding some obstricals on the floor of the bar.
these are examples of balance excercises
if you want more ( use Berg Balance Scale) use the test as excercise
also you can use the gem ball to improve balance