Viral photo reveals firefighter's touching stair stepper memorial

A Facebook photo of a man on a stair stepper in full firefighter gear is going viral after the September 11 15th anniversary.

The post with the photo says the man asked if he could climb on the gym machine 110 sets of stairs to honor his fellow firefighters who died in the attacks.

The post has the answer to that question: "Yes sir, you can. I am not one to get emotional, but a few tears were shed. Thank you for your services."

The post has been shared more than 14,000 times and has more than 300 likes.