From Pippa Middleton’s new book, Celebrate, which is something to do with how to throw a party. This is a suggestion for a sack race:
“Everyone stands along a starting line and, on ‘Go’, players start jumping in their sacks towards the finish line. Over-enthusiastic racers will most likely get themselves in a tangle and fall. The first person to cross the finish line is declared the winner.”
(Stolen from Christopher Howse’s excellent review).