Largest space hopper race

According to Official Guinness Records,

The largest space hopper race was achieved by 771 participants at an event organised by Yorkshire Cancer Research, Weston Park Hospital Cancer Charity and Cavendish Cancer Care (all UK) at the Don Valley Grass Bowl in Sheffield, England, UK, on 25 July 2010.
The event raised £50,000 for the three charities.

For a complete list of 2010 records, please visit 2010 Guinness Records in United Kingdom.

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