Jamie Oliver during a scene filmed in Los Angeles from the second season of "Jamie Oliver's Food Revolution" on ABC. Mitch Haddad/AP hide caption

itoggle caption Mitch Haddad/AP

Treadmills desks can be built at home as long as you have a treadmill. Sharyn Morrow/Wikimedia Commons via Flickr hide caption

itoggle caption Sharyn Morrow/Wikimedia Commons via Flickr

Orthopedist Popi Gianakouras helps 45-year-old Bob Rothaker with physical therapy to treat his sore shoulder. Richard Knox/NPR hide caption

itoggle caption Richard Knox/NPR

Most Americans spend the majority of their waking hours sitting still in front of a computer or television. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Study author Virginia Rauh of Columbia University recommends that parents wash all fruits and vegetables and buy organic when possible. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Sam Thayer, an urban forager who has written field guides to edible plants, munches on Siberian elm seeds called samaras he found in Washington, D.C. Thayer says the seeds taste like a cross between sweetened oatmeal and lettuce. Maggie Starbard hide caption

itoggle caption Maggie Starbard