After their big win at the 2008 Olympics, the British Yngling team's latest challenge might seem like a drop in the ocean - but it's still one that will make a big impact on home shores...
Gold medalists Sarah Webb, Sarah Ayton and Pippa Wilson - also known as "three blondes in a boat" - are among a team of athletes taking part in a mission to highlight the link between diet, lifestyle, sport and health and raise more than £100,000 to help us beat heart disease together.
For their particular challenge, the trio will be taking to dry land and treking from Land's End to John O'Groats, where they will be stopping off at schools along the route to present a health and fitness roadshow.
Before this particular mission sets off, Webb and fellow sportsperson Nick Dempsey, who came fourth in Beijing after winning bronze at the Athens Olympics, will be getting on their bikes for a 880-mile cycle ride. Starting this weekend, they are expected to pedal roughly 100 miles a day during the trek north from Cornwall to Scotland.
"This is a real challenge and something that I am really enjoying," Webb said. "It is a fantastic opportunity to raise money for a great cause in the British Heart Foundation but also show young people that they really can enjoy getting fit and enjoy sport."
Organised by Be Number 1, a website that helps raise financial support for aspiring British Olympians, Paralympians and world champions, other athletes taking part in the challenge include extreme runner Kevin Carr, 28, from Woolacombe, who is attempting to run a 1,111-mile cross-country route in just 21 days. There's also Jason Gill, who was disabled after falling more than 50ft in a rock-climbing accident in 1997, who will be hand-cycling the route.
Meanwhile, Robin Simpson, a 30-year-old commercial quantity surveyor from Leeds, will be trying to set his 12th endurance world record by cycling from John O'Groats to Land's End and back again. Finally, there's British kite-surfing champion Stephanie Bridge, who will kite-surf the 890 miles to John O'Groats by travelling up the west coast line of Britain this August.