National Walk to Work Day is April 3 (USA)

"Friday, April 3 is National Walk to Work Day. Endorsed by the U.S. Department of Health and Human Services, the sixth-annual event encourages Americans to turn their commute into an exercise opportunity. The reason is clear: According to the U.S. Centers for Disease Control and Prevention, the prevalence of obesity among adults aged 20-74 more than doubled between 1980 and 2006, soaring from 15 percent to nearly 33 percent. Meanwhile, study after study indicates that moderate exercise for 30 minutes per day reduces the risk of heart disease, cancer, stroke and diabetes. Participation guidelines for National Walk to Work Day couldn't be more flexible. If walking to work is impractical, at least shun the elevator and walk up the stairs. If you take public transportation, get off a stop early and walk the rest of the way. And if your commute is too long to consider walking, simply pretend it's National Walk to Lunch Day instead." - Fox