"I did not believe I could do it," she acknowledged. "I was nowhere near in the shape I am now."
Olympics 2012: Aliya Mustafina wins gold; Gabby Douglas finishes last →
"I tried to say it didn't matter if I didn't medal, but I've got every other title to my name," Tweddle said. "I can now say I would have been devastated walking away with no medal. I am going to sleep easy tonight."