http://www.usaweekend.com/article/20...om-The-Doctors (see tip #10 repeated below)
Pump up the bike tires.
A German study found that people who rode bikes three times a week for 30 minutes each over a span of three months increased the volume of the hippocampus -” a brain region associated with spatial navigation and long-term memory-” by 16%. Researchers also found improvements in short-term memory. Riding your bike around town is a great way to challenge your brain "you have to recall the best route to your destination, navigate narrow alleyways and react to potholes” all of which pushes your brain to work in ways that it might not during everyday life. You will burn calories, decrease your carbon-footprint guilt and likely run into a neighbor or two along the way "all good things for your brain.