"Marathons are hard to train for," the Park City resident and 1992 Gold Medalist said. "I didn't plan on doing another one until I turned 50. And then, everything changed."
Before the tragic bombings occurred, the 2013 Boston Marathon, Summers 4th Boston Marathon overall, was everything she dreamed it would be.
"The fact that I was there, that I was going to actually run the Boston Marathon, was amazing."
"It was such a great day. Such a beautiful, amazing, gorgeous day," Sanders recalls. "It was perfect, until it was the exact opposite."
The first bomb exploded as Sanders was putting her key in to her hotel room door.
"You never assume it's the worst. But then, we heard, felt and saw the second explosion," Summers recalls.
"That's when I started screaming."
Even though Summers and her family saw the second explosion, they weren't sure what the explosion was.
"We just knew, this was not right."
After the chaotic events played themselves out in Boston and across Massachusetts, Sanders and her family returned to Park City, Utah.
Three days after the bombings, Summers says she knew she was going to run Boston again, in 2014.
"It's with purpose this time." Summers said. "I will be honored to be there. I will be honored to be standing there with everyone else, to represent, all the good and all the positives of that race. And to remember those that were affected, injured and killed."