The singer competed in the run...
She lived up to her Sporty Spice nickname as the first female to cross the finish line, completing the challenge in one hour, 35 minutes.
Chisholm later took to her Twitter.com page to thank fans for their donations and hint at a return to the triathlon next year (12).
She wrote, "I did it!!! Thank you for all your Support... Had a ball today. See you next year!"