How have the bodies of Olympians changed over the decades? (NPR, with audio and infographic) Plus, check out the science behind Olympic abs.

Americans are walking more … but still not enough. (CDC)  And our kids’ cholesterol levels are better … but still not great. (HealthDay)

Is Susan G. Komen for the Cure misleading women about the benefits of mammograms? (MedPageToday)

Controversial, but it worked: New Yorkers are eating more healthfully after the 2008 law limiting trans fats. (WNYC)

The biggest healthcare crisis in rural America may be transportation. (Salon)

Good for you, good for our environment: check out the innovations at green gyms. (LA Times)