Here is question 18 of 25 from Brain Fitness 101: Answers to Your Top 25 Questions.Question:Is physical fitness important?Key Points: Exercise improves learning through increased blood supply and growth hormones.Exercise is an anti-depressant by reducing stress and promoting neurogenesis.Exercise protects the brain from damage and disease, as well speeding the recovery.Answer:Yes. According to Fred Gage, PhD, of the Salk Institute for Biological Studies, “We now know that exercise helps generate new brain cells, even in the aging brain.”According to the research of Richard Smeyne, PhD at Saint Jude Children’s Research Hospital in Memphis, with just two months of exercise there are more brain cells and that higher levels of exercise were significantly more beneficial than lower amounts, although any exercise was better than none.