The human body is all connected, so you can't take care of one part of it without benefiting some other part. Physical exercise is important for good health, for both the body and the brain. Simply increasing your blood flow kicks up the oxygen and glucose levels in the brain. The coordination it takes to perform exercises also gives the brain a workout, especially if you're trying something new. Exercise also means you're battling sedentary lifestyle, or one free from mental stimuli.
Food is also important. There are many foods that have been associated with brain health, including fish oil, eggs, protein and dark green vegetables. Green tea, herbal tea and nuts are also good "brain food." Eating right, getting the required amount of sleep and exercises, both mental and physical, are the keys to improving memory and overall brain function.