The vet who ran the Boston Marathon on one leg is a fitness beast

Just before 3 pm on April 15, 2013, two pressure cookers loaded with shrapnel and other harsh items placed in backpacks exploded near the finish line of the Boston Marathon.

Three innocent people were killed, and more than 260 were wounded, quickly turning a patriotic day into a bloody mess of confusion and chaos that made world news.

Related: Navy SEAL: Here's how to stay fit when you have no time to workout

After an intense four-day manhunt, authorities tracked down the two suspects (brothers) who they believed were behind the deadly terrorist attack (one died during a shootout) that shocked the world.

Fast-forward to four years later and something special happened. Staff Sgt. Jose Luis Sanchez, a Marine who lost his left leg during an IED attack in Afghanistan, completed the 26.2-mile run while holding an American flag signed by many service members he was deployed with.

Although Sanchez's injuries sidelined him, he battled his way back to not only strengthen his mind but his body.

After gaining national attention for the patriotic act, this decorated warrior has become an instant inspiration to those with and without physical disabilities.

Also Read: 7 military fitness tricks for working out without a lot of fancy gear

Check out Muscle Madness' video below to see this is Marine's impressive physical endurance for yourself.