Last July, Jack Jablonski started controlling his hips on his own – major progress after his spine was severed during a high school hockey game on Dec. 30, 2011.
He was 16 at the time. Jablonski, now a sophomore at the University of Southern California, continues to advance on his goal to prove doctors wrong by walking again.
On Tuesday, Jablonski tweeted that he woke up with pain and tightness up and down his right leg.
"Shouldn't be able to feel," Jablonski wrote. "Progress...? Pain is good."
"My goal physically is to get back on my feet," Jablonski said in a February feature on NBC Sports Network. "I think it's gonna happen. It's a matter of time with the work my foundation is doing and knowing that it is possible."