Older people can develop their brains as well. Cornell University studied a group of seniors who have a short—term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for babies, exercise for older people should not be too simple. Learning some new skills or actions, such as with yoga or tai-chi helps to open up memory paths in the brain that may not have been used for a long time. For most people, any type of physical activity that increases the heart rate is helpful. The main aim is to increase the brain’s flow of blood. And your brain can benefit from as little as two to three hours of exercise a week.
1. What is the main idea of this passage?
A. How exercise makes people strong. B. How to get good scores on a test.
C. How exercise helps the brain. D. How the brain can change.
2. According to the passage, what is the connection between exercise and brain development?
A. Exercise helps make our blood vessels.
B. Physical exercise helps us think better.
C. The brain needs special mental exercise.
D. The more exercise, the bigger the brain.
3. The smallest amount of exercise required to gain any benefit is
A. three hours per week
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