Editor's note: The following is an unedited release from the National Park Service.

A step outside is a step in the right direction. On Park Rx Day, April 23, National Park Service sites will offer free admission and host special events to highlight the important role of greenspace in physical and psychological wellness.  Park Rx Day is part of the National Park Week celebration taking place from April 15 through 23.

“Nature is a powerful medicine,” said National Park Service Acting Director Michael T. Reynolds. “Parks and other public lands provide pathways to healthier lifestyles. They offer nearby, accessible places to take a walk, spend time with family and friends, and enjoy a break from the stressors of everyday life. A little investment of time in nature can pay big dividends.”

The average American spends 93 percent of time indoors, and 10 hours each day in front of a screen. Most do not get the recommended levels of physical activity. A growing number of healthcare providers are writing prescriptions for patients that include recommended doses of outdoor time and activity. The Park Rx Movement aligns with the Surgeon General’s Step It Up! campaign, which promotes walking and creating walkable communities to improve public health.

“We know that an average of 22 minutes a day of physical activity – such as brisk walking – can significantly reduce the risk of heart disease and diabetes,” said Dr. Vivek H. Murthy, the 19th Surgeon General of the U.S. Public Health Service. “Park Rx Day is setting a great example by encouraging individuals to use their parks and greenspaces to improve their physical health and emotional well-being by connecting with family and friends over a walk.”

Dozens of partners are supporting Park Rx Day events, including the American Red Cross, the Institute at the Golden Gate, and the National Recreation and Park Association (NRPA).

“Parks offer a number of recreational activities, such as running, walking, and swimming, that provide tremendous health benefits,” said Barbara Tulipane, NRPA president and CEO. “Parks are also a great place to spend quality time with family and friends while enjoying the benefits of nature. Anyone looking to improve their overall health and wellness should consider a visit to their local park.”

Enjoy any of the country’s 417 national parks on your own or take part in one of the 50-plus Park Rx Day events planned across the country. Organized activities include fitness walks, Zumba and yoga sessions at Gateway National Recreation Area in New York City, a 4-mile hike from Tumacácori National Historical Park to Tubac Presidio State Historic Park in Arizona, games and sporting events at Hot Springs National Park in Arkansas, biking on the Skyline Drive in Shenandoah National Park In Virginia, and a health fair with free screenings at Golden Gate National Recreation Area in San Francisco.

Following is a list by state of Park Rx Day events taking place in national parks and other sites: