What do mental health and dementia have in common? Mental illness is a disorder of the brain. Same with dementia. In physical therapy term, we have what we call strength reserve. The more strength reserve that we have, the higher the chances of a person to recover when they injure themselves or when they have surgery. Same thing with our cognitive reserve. The more cognitive reserve that we have, the lesser the risk for us to get dementia. Our brain has basically three functions, how we think, how we feel, and how we move. Here are some tips to improve our mental or cognitive reserve.