Ultra-Marathoner Gina Natera-Armenta: 'I'm so happy to be alive.'

Sept. 25, 2009— -- After four days trapped in the woods with triple-digit temperatures beating down on her and no water, Gina Natera-Armenta was preparing to die.

The ultra-runner, who was experienced but unfamiliar with the trail she had taken with her brother-in-law in California's Cleveland National Forest, was severely dehydrated and nearing kidney failure.

And, then, on Wednesday, she saw the helicopters flying overhead. Although described as "beat up pretty good" by a rescue worker, the Californian was able to attract their attention.

"I'm doing great," Natera-Armenta, 36, told "Good Morning America" today from her wheelchair in the hospital. "I'm so happy to be alive."

Natera-Armenta had set out on the park's Hot Springs trail around 7 a.m. Sunday with her running partner and brother-in-law, Fidel Diaz, 53. The two regularly compete in races of 50 to 100 miles but were accidentally separated a few hours into their planned 25-mile run.

When the trail ran out and the two tried to get across a creek to more manageable terrain, they lost each other. Not carrying a cell phone because there is no reception in the area, Natera-Armenta began trying to find her way.

"I can think it was probably about eight hours, or so when I realized I had to stay there and I had to remain calm and rest and wait for the next day," she said.

Natera-Armenta then dropped one of her precious water bottles in a ravine. Lost and low on water, she decided to stay put. She took shelter in the shade of a boulder, in a steep, sloped area thick with dry brush.

Natera-Armenta's husband, Armando Armenta, said he was used to his wife's long runs and that when she didn't come home Sunday, he assumed she was staying with family in the area, as she often does.

"When I came home Monday, and I realized she still wasn't home, I just realized something wasn't right," he said.