Brain Fitness Exercises Like everything with aging, the mental abilities such as retaining short and long term memories, thinking , planning and problem solving see a continuous decline if they remain unused. The only thing that distinguishes us from animals is our ability to think and if we start loosing that, we are heading for disaster. People world over have been perturbed with this problem and there is a very simple solution to solve this. The principle that applies to physical health also applies to mental health. Use it or loose it.