Two Georgia firefighters are making headlines today after a video surfaced of them climbing 110 stories to honor the heroes who lost their lives on 9/11.

According to News 4, Timothy Soler and Alex Liczewsky hit the stairs at exactly 8:46 a.m., “which was when the first plane hit one of the towers, killing everyone on board and hundreds inside the building.”

The firefighters didn’t get off the StairMaster until they climbed to the top and back.