Exercise can positively affect the growth of new neurons in parts of the brain that control memory. A recent study in the Journal of Alzheimer's Disease found that moderate exercise promotes formation of neurons in parts of the brain responsible for reducing Alzheimer's risk.
Recommendations from the Mayo Clinic Alzheimer's Disease Research Center specify 150 minutes of cardio each week. These should be spread over 3-5 days, and should include interval training.
Interval training includes spurts of intense effort alternating with active recovery periods, similar to the intervals in an indoor cycling or spin class. A qualified personal trainer or group instructor can give recommendations for newcomers to class.
These findings show us once again the importance of exercise to overall health and well-being.