Longest duration performing a headstand on a flowboard

According to Official Guinness Records,

The longest duration performing a headstand on a flowboard is 15.874 seconds and was achieved by Zhang Liang (China) at GWR Live on Royal Caribbean's Quantum of the Seas, docked in Shanghai, China, on 13 November 2017.The waves surpassed the minimum speed needed of 20 mph and reached 30 mph during the attempt as confirmed by the engineer.

For a complete list of 2017 records, please visit 2017 Guinness Records in China.

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