Together, Gallup and Sharecare asked people in 189 communities nationwide if they'd exercised for 30-plus minutes a day three times or more in the last week.
The Tax Day organizers say they want to follow the same marching route as the Women's March on Denver and are applying for appropriate permits.
"It's a workout mecca really for Denver. It's just so energizing to have so many people around you and real motivating. People are high-fiving each other."