HEALTH TOPICS 
What we do—and don't—know about exercise
Image: Bigstock
Experts' advice has changed as we've learned more about the connection between physical activity and health.
If exercise could be packed into a pill, it would be the single most widely prescribed and beneficial medicine in the nation.
To continue reading this article, you must log in.
Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.
- Research health conditions
- Check your symptoms
- Prepare for a doctor's visit or test
- Find the best treatments and procedures for you
- Explore options for better nutrition and exercise