Hi Adam,
balance is such a big word. There is lots of different systems within your body that are part of creating the perfect balance. And each of these systems will have specific exercises to help you achieve your goals.
I would suggest for you to go and see a Physical Therapist and get a thorough assessment and then an exercise programme that is specifically designed for you.
It is important for you to have a programme that challenges your balance in just the right way and with just the right intensity and frequency, as after TBI, you might get too fatigued with the wrong programme. So, monitoring and adjusting the programme over time is vital.
With challenging balance, there is also a risk factor attached and you really want to be safe.
Good luck and all the best,
Fyzzio