Play video content EXCLUSIVE TMZ.com

1:12 PM PT -- Adam tells TMZ walking 17.2 miles at the L.A. Marathon was the greatest weekend of his life. He says he's still beat up from the experience but clearly it was worth it. Check out the vid ... he tells us exactly how a paralyzed person can walk with help from the ReWalk Exoskeleton.

Adam Gorlitsky -- who is paralyzed from the waist down -- provided one of the most uplifting stories from the Los Angeles Marathon ... walking a stunning 17.2 miles.

As we first reported ... Adam walked with help from the $95k ReWalk Exoskeleton. His journey began Friday at midnight at Dodger Stadium, and by 7 PM ... Adam had made it to mile marker 11 at Grauman’s Chinese Theater in Hollywood, walking for a whopping 19 hours straight.

Play video content TMZ.com

The hills at Chavez Ravine and managing traffic before the race course was completely set up proved to be big obstacles for Adam. Exhaustion and pain on his wrists also forced him to take a breather.

He returned Sunday at 7 AM in Westwood at the brand new start line for the "ReEnabled Division" at mile marker 20. The new start line's something Adam and the foundation, I GOT LEGS, helped create for others like him who want to take part in the elite marathon with a little help from the course.

Adam walked the remaining 6.2 miles and crossed the finish line at around 4 PM. He started the race with a support group that included friends traveling from other states to walk with him. Adam finished with a bigger group as others inspired by his story decided to walk the final stretch with him.

While Adam didn't walk the entire 26.2-mile course ... he vows to keep trying until he becomes the first paralyzed person in history to complete a full marathon on U.S. soil. When you see his determination in this video, it's hard to doubt he'll do it.