BATON ROUGE, La. (BRPROUD) – A capital area gym is using this weekend to honor the thousands of first responders who risked their lives during the September 11, 2001 tragedy.

How many people were killed in the September 11 attacks?

On the aforementioned morning, a group of 19 terrorists hijacked four commercial planes. The first two planes were crashed into the Twin Towers of New York City’s World Trade Center, resulting in the deaths of 2,750 people.

The other two planes were crashed into the Pentagon in Arlington, Virginia and in a Pennsylvania field. A total of 224 individuals lost their lives in these two attacks.

Authorities believe United Airlines Flight 93 -the hijacked plane that ended up in Pennsylvania- was likely headed for Washington D.C. But the terrorist’s plans were thwarted when Flight 93’s passengers and crew attempted to take control of the aircraft.

Everyone on board was killed, including the terrorists.

It’s estimated that a total of 2,997 people lost their lives in all of the 9/11 attacks.

What sacrifices did first responders make on September 11?

According to the City of New York, more than 40 first responders and police officers died as a result of the attacks, and over 91,000 rescue, recovery, volunteers, and clean-up workers sacrificed their lives as they were exposed to environmental hazards (toxic mixes of dust and chemicals) at Ground Zero and related locations in the days and months after the attacks.

How Crunch Fitness is honoring 9/11 first responders

To honor the thousands of first responders mentioned above, Crunch Fitness in Baton Rouge is inviting locals to use Sunday, September 11 to climb 110 stories on the gym’s Stairmaster. The action serves as a sobering reminder of the World Trade Center’s 110 flights of stairs.

A local firefighter is reportedly among the individuals who took Crunch Fitness up on it’s offer to pay homage to 2001’s self-sacrificing rescue workers.

The rescue worker is reportedly completing the 9/11 Stairmaster Challenge while wearing typical firefighter gear, which can weigh as much as 45 pounds.

Sources say that as of 4 p.m., Sunday, the firefighter is using the gym to honor fellow comrades, some of whom made the ultimate sacrifice 21 years ago.

Crunch Fitness says those who climb the 110 flights this weekend are also recognizing efforts made by local fire departments on a daily basis.

The gym’s 9/11 Stairmaster Challenge will continue until 9 p.m. Sunday evening and all who participate are encouraged to share their endeavors on social media with the hashtag #CrunchStairChallenge