Michelle Obama will be leading the leaping at the White House on Tuesday for a worldwide challenge to break the record for the number of people doing jumping jacks.
Organized in association with National Geographic Kids, the Let's Jump! event will see the US First Lady join hundreds of school children from the Washington area who will perform one minute of continuous star jumps in the grounds of the White House.
The event, which will be attended by an official from Guinness World Records, will signal the beginning of a 24-hour challenge across the globe to break the record.
A live stream of the event will be available to view at http://wh.gov/live.
To set a new benchmark, more than 20,425 people need to get on their feet and perform jumping jacks for one minute during the 24-hour time period between 3 p.m. ET on October 11 and 3 p.m. ET on October 12.
Anyone can join one of many sponsored events that are being held worldwide.
They can also organize their own event or jump by themselves following official Guinness World Records rules. 
Official jump event locations, documentation forms, rules and other information can be found on the National Geographic Kids' Let's Jump! website at www.kids.nationalgeographic.com/lets-jump.
The Lets Jump! world record attempt was inspired by Mrs. Obama's, 'Let's Move' initiative, which is dedicated to solving the problem of childhood obesity.
The UK leg of the attempt was launched last Wednesday by World Dance Champions and stars of Britain's Got Talent, Flawless at the capital's London Eye landmark.
Speaking ahead of next week's event, Marlon 'Swoosh' Wallen, creator of Flawless said: "Star jumps are fun and can be done anywhere - and they're also a great way to keep fit!"
"Plus, breaking a Guinness World Record will be something kids and their parents can be proud to accomplish together."
To find out more about the UK leg of the record attempt, visit http://ngkids.co.uk/cool_stories/1715/let_s_jump_.
