Answer:
Exercise regularly.
Explanation:
Exercise has many known benefits, and it appears that regular physical activity benefits the brain. Multiple research studies show that people who are physically active are less likely to experience a decline in their mental function and have a lower risk of developing Alzheimer's disease.
5 tips to keep your brain healthy - Mayo Clinic Health System
https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/5-tips-to-keep-your-brain-healthy
