A Boston Marathon bombing survivor who lost her leg in the terror attack made a return to running Sunday, completing a 5K race in nearby Lowell.

"It was more of a shuffle," Roseann Sdoia, who was watching the race near the finish when two bombs exploded on Boylston Street, told WCVB-TV. "A lot of walking, a short shuffle and a lot of walking."

Sdoia, whose right leg was amputated above the knee, trained on a high school track for the 5K since April, the first anniversary of the marathon bombings. The blasts killed three people and wounded 260 others.

"It's something that I think I want to get back to, but it's definitely a love-hate relationship," Sdoia said. "It's not easy, and so there is a lot of anxiousness."

Since losing her leg, Sdoia has become an advocate for amputees' rights. In July 2013 she addressed the Amputee Coalition’s national conference.

"When the first bomb went off, we saw the plume of smoke down the street," she told attendees. "And in my head, I processed kind of quickly that it was unusual that there would be any sort of celebratory noises, gunshots or cannons for the runners who were going by now. The elite runners had crossed hours ago, so it wasn’t normal.

"There was a guy to the right of me who started yelling, 'Everybody, get in the streets, get in the streets,'" Sdoia continued. "But the barricade they had between the street and the runners was too high, and I was not going to be able to get over it. So I turned to my right to run away, and I basically ran into the bag that had the second bomb in it. And I just recall the pop-pop at my feet and then it going black and thinking to myself, 'This is not a good situation. This is bad.'"

Sdoia ran the 5K with Jothy Rosenberg, a fellow amputee and founder of the Who Says I Can't Foundation, which helps pay for prosthetics for amputees who want to return to sports activities. They finished in an hour and a half.

"That was a huge accomplishment," Sdoia told New England Cable News. "I'm exhausted, it's achy, but I'm happy I did it."