Today, April 3, is National Walking Day 2013. This day, established by the American Heart Association, kicks off a "season" of outdoor activity, especially walking. As the weather has gotten nicer throughout much of Missouri, the snow seems to be gone until later this year and temperatures are on the rise. This provides for optimal conditions to move outdoors. The challenge posed by the American Heart Association through National Walking Day, is for individuals to lace up their sneakers and get outside today to walk for at least 30 minutes.