Walking is the most popular physical activity in the United States. However, experts say walking alone may not be enough to keep people fully healthy. A recent study showed that only about a quarter of adults meet the full exercise recommendations.

Researchers looked at a large national survey with over 396,000 adults. It found that 44% said walking was their main activity, but many did not meet the guidelines for both aerobic and muscle-strengthening exercise.

Health authorities advise including other activities, such as strength training, flexibility, and balance exercises. These can help improve long-term health and reduce the risk of injury.