Mark Webber is hoping to keep his competitive juices flowing even after the end of this year's F1 commitments with Red Bull Racing, by taking on the best adventure racers in the world during his Tasmania Challenge event.

The supremely fit Australian reinstated the race last year following the hiatus that resulted from his leg-breaking accident on the 2008 edition, and is looking to fly in a join the fun over the final three days following the last round of the F1 season in Brazil.

The five-day course includes running, ocean and river paddling, orienteering, mountain biking, as well as a number of other still secret activities, and has already attracted 14 elite teams and 26 made up of adventure race enthusiasts.

"While the course is over 350 competitive kilometres, it is more than the distance itself that defines this test, as each stage has a special twist," Webber explained, "The course looks awesome. The details remain a secret until each morning of the race - last year was brilliant, yet this looks even better.

"Really, there is no better place anywhere in the world to do an adventure race than Tasmania. It doesn't disappoint when it comes to the locations we can find to test people and that's why it is such a great place for the race. Year after year, we have sensational locations."

A celebrated field of Olympians, sporting icons and world champion adventure racers will spearhead a list of over 80 competitors who will push their bodies to the limit in the challenge, which starts in Launceston on 28 November.

"This is by far the strongest field we've ever had for the Challenge," Webber confirmed, "I just can't believe the interest we've had this year. It's definitely one of the best, if not the best, multi-sport adventure race in the world."

Arguably the world's greatest multi-sport athlete, New Zealand's Richard Ussher, will be joined by countryman Braden Currie in Team Tasmania. Ussher, a two-time World Adventure Racing champion and five-time winner of his home's Coast to Coast race, will be hard to beat.

However, current World Adventure Racing champions, France's Myriam Guillot and Jacky Boisset, who will take part as Pure Tasmania, will be a real threat to the Kiwis. The duo won their world title in Tasmania last year and they know the local conditions.

Last year's Swisse Mark Webber Tasmania Challenge winners, the locally based Ironhouse team of Mark Padgett and Mark Hinder, will also have their eyes on a big pay day, with a $20,000 first prize cheque on offer.

Among the star-studded team-based field is Olympic triathlete Courtney Atkinson, who will compete along side Olympic gold medallist paddler Ken Wallace as Team Rexona.

Another London-based triathlete, Brendan Sexton, will be joined by Aaron Royle, who recently won the ITU 2012 Under 23 Triathlon Grand Final, to tackle the five-day race as the 2XU Aussie All Stars team.

The high-profile field also includes the all-woman combination of ASP World Surfing Championship star Sally Fitzgibbon and surf life saving's Jordan Mercer, competing as the Red Bullettes, and 2012 Olympic rowing bronze medallists Karsten Forsterling and Chris Morgan, who will need to find their legs on land while competing as Team James Boag.

Experienced adventure racers Jarad Kohlar and James Pretto will be in action as Swisse Active. The Renault Adventure team of former ironman Guy Andrews and triathlete Darren Clarke finished second in the Challenge last year, and hold high hopes of going one better in 2012.

The three-person relay team section will be headed by Team Renault, consisting of multiple world and national ironman champion Shannon Eckstein and two NZ world champion surf lifesavers Kevin Morrison and Andrew McMillan.

Former AFL greats Glenn Archer and Leigh Colbert have entered as an 'enthusiast' team, with the goal of making it to Hobart on 2 December, but not chasing the ultimate first prize in the Elite competition.

The event raises money for the Mark Webber Challenge Foundation, established in 2006 to umbrella all of Mark Webber's philanthropic activities.

"It's very special for me," Webber admitted, "It's a real buzz for me to see that people get a lot out of the event themselves, and obviously we know that we can put back in with the funds raised going to really needy causes."

Before he heads to Tasmania, however, Webber has the small matter of two remaining grands prix to deal with, as he attempts to overhaul Kimi Raikkonen for third place in the drivers' standings. The Australian trails the Abu Dhabi Grand Prix winner by 31 points with a maximum of 50 available from the races in America and Brazil.