Claire Casselton, 49, broke the Guinness World Record for the Fastest Marathon Dressed as a Skeleton (female) on Sunday, April 21, coming in at 3:51:01, with just 162 seconds to spare. She decided to run the 26.2-mile race in costume to raise money for the Bone Cancer Research Trust (BCRT) after her sister-in-law Carolyn was diagnosed with the condition last year. Claire had to wear a skeleton mask for the entire race