Take a look at the kind of thing Clipper Race teams will be facing when they set off from St Katharine's Docks today on their 11 month marathon.
Footage: Youtube/ Clipper Ventures
High speed winds and rough waves are the norm on the exhausting journey, where crew members can only work four hour stints at a time because of the punishing conditions.
They'll have to consume over 5000 calories a day to keep up - that's double what an average person is supposed to be eating
ITV News London's Chris Paxton is taking part in the Clipper Round The World Yacht Race. His boat has arrived in France after race 1.
ITV News London's Chris Paxton is taking part in the Clipper Round The World Yacht Race. But his team Switzerland has had a mixed start.
All the facts you didn't know about the Clipper Round the World Yacht Race.