Joanna was third at this year's Ironman UK in Bolton, in August, and earlier in the year was sixth at Ironman Lanzarote. She turned professional this year and now races as part of Team TBC Sportsaid. She was the 40th woman finisher at Kona last year and is very much looking forward to starting with the elite women this time.
Trains Stirling and Broxburn
It's been an incredible year for Cat Morrison. She won the ITU World Duathlon Champs on home soil in Edinburgh in September and pulled off a remarkable achievement at Ironman Lanzarote in May by winning despite a 45-minute delay caused by a broken chain. She has not lost a race this year. She came 16th in Kona last year, despite suffering from swine flu.
Trains Tucson, Arizona
Leanda has been competing in triathlons since 1994. This year saw her take silver, behind Julie Dibens, at the Abu Dhabi International Triathlon and she came second at the Vineman 70.3 in July, where she set a personal best on the run. She finished eighth in Hawaii in 2007 and could well match or better that performance this year.
Trains Boulder, Colorado
Julie, who's making her debut at Kona, won the 70.3 World Championships in 2009, and was Xterra World Champion in 2007, 2008 and 2009. She started 2010 with a bang by winning the inaugural Abu Dhabi International Triathlon, beating fellow Brit Leanda Cave into second place. She's having a great year, with wins at the Boise and Boulder 70.3 triathlons, and in her form - and with her power on the bike - could upset Chrissie Wellington's plan to make it four world titles in a row.
Yvette has been racing triathlon since 2004 and turned pro in 2006. She won the Cowman Middle Distance event in July, Ironman UK in August (and came fourth in Ironman 70.3) and since then has been putting her efforts into preparing for Kona. She trains with Glenn Cook and Bodyworks XTC.
Rachel did her first triathlon as university, where she trained to be a lawyer. In the past she divided her time between triathlon and law but has been training and racing full time this year. She's now racing as part of Team Abu Dhabi. Last year she finished second at Ironman Lanzarote and 6th in Hawaii. This year she was second at Antwerp 70.3, a remarkable comeback after an appalling injury at the Abu Dhabi race, when a fall from the bike left her with three sliced tendons in her foot.
Trains Boulder, Colorado
The triple Ironman World Champ - she won at Kona in 2007, 2008 and 2009 - also holds the world record of 8:19:13 for the distance, which she set at Challenge Roth in July. Chrissie's never been beaten over the Ironman distance, but that could change at this year's race (although our money's on her making it four in a row).