December 15, 2015 8:22 AM EST

Serena Williams was in the middle of the Serena Williams Live Ultimate Run in Miami when she got tired of running. The tennis star hopped in a taxi instead of finishing the race.

“I didn’t run the whole way this year, but next year I will,” she said in a video posted on Facebook. Her sister, Venus, did finish the race.

The 5K race, the Serena Williams Live Ultimate Run, raises money for the Serena Williams Fund, which supports UNICEF and other charities.

Sports Illustrated recently announced that Serena Williams would be the magazine’s 2015 Sportsperson of the Year,

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Write to Justin Worland at justin.worland@time.com.

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