A SMOOTH entrance would be preferable but David McNamee wants to make an immediate splash when he embarks on what he hopes will be a successful second stage of his career in Dubai today.

The 26-year-old from Irvine, who finished seventh in last summer's Commonwealth Games, will throw himself into his first race on the Ironman circuit following his move up to the longer and tougher distance at the end of 2014.

With his hopes of earning a place in Great Britain's Olympic team looking slim, McNamee sought a change of direction, believing that a fresh challenge would provide the incentive he needed to carry on pushing himself to the outer limits.

However with the desert race forming the first leg of the million dollar Challenge Triple, he has no plans to ease gently into the fray.

"It's very exciting, I'm really looking forward to getting stuck in," he said. "I know I will improve as the season goes on and I get more used to the format. However I think I could start off pretty well. It could be a shock to the system. I'm expecting that about half way through the marathon. But we shall see."

With his training regime radically revamped during a month-long stint in Spain under former GB head coach Joel Filiol, it has all been a test of endurance for McNamee, who ended last season by coming 14th in the ITU Grand Final in Edmonton. Previously a training partner to the Brownlee brothers, Alistair and Jonny, in Leeds, coming close but without lighting a cigar, had become increasingly frustrating.

However with the target of vying with his fellow Dubai-bound Scots Ritchie Nicholls and Fraser Cartmell for a podium finish and, ultimately, places at the year-end world championships in Kona, the Ironman arrival is confident he will not run immediately out of steam.

"It will be interesting to see how I go first time out but I will be in good shape so we shall see," McNamee said. "I'm doing Ironman South Africa at the end of March, so after that race, my body will definitely know it's doing Ironman now."

Great Britain's Jodie Swallow and Switzerland's reigning Ironman 70.3 world champion Daniela Ryf head the women's field.