Every year, thousands of first responders around the country participate in 9/11 Stair Climbs, climbing or walking the equivalent of 110 stories, or 2,200 steps, often in full firefighting gear. It is not a race. Each 9/11 stair climb participant is making the trek in honor of the 343 FDNY members who lost their lives on Sept. 11, 2001, as 110 stories was the height of each World Trade Center building.

Sign up below to participate.