The former Team USA Olympic high jumper who was paralyzed in a training accident in California last month says he's making HUGE progress -- and can now move his arm!!!
But in a new video shot from his hospital bed, the 39-year-old said he's "getting better every day. Just feeling a lot better."
Nieto -- who underwent emergency surgery following the life-threatening accident -- is also trying to walk again ... though it might take some time.
"It's been a tough experience, not easy. You know, learning how to walk again, move my hands and getting my feet moving again."
"But I'm getting stronger, so it's getting better. It's a process. I thank everybody out there for all their love and support."
Nieto's girlfriend has said he's a fighter who hopes to be jumping again as soon as possible.