“That’s something I’m very fond of,” says Andy Potts, the six-time winner of the renowned Escape to Alcatraz triathlon and consistently first from the water at the Ironman World Championships in Kona. “My physiology excels when I raise my heart-rate to eight to 12 beats below max and then just hold without having to surge. I’ve done enough races where it‘s me out front on the bike on my own and I don’t run that much slower [compared to being overtaken and forced to cycle in a pace-line of triathletes].

“I can tell when the ride is easy because I’ll get off and rip a 1hr 10min [half-marathon] and that’s because we held each other’s hands on the bike. My one concern here is judging the effort correctly, but what gives me confidence is knowing that if people ride past they will have done the work themselves, as opposed to just tactically sitting in until they can surge at an easier time. A longer draft zone will slowly feather people apart. Then it’s painfully obvious who can ride their bike.”

Such is the appeal to the 38-year-old 2004 Olympian that it has even persuaded him to race outside North America for the first time in years. “I treat my profession as a business,” he says. “I could be giving up as much as 10 days coming here but when I race in North America I’m away for a maximum of two nights and then I’m a normal dad to my two kids when I come home.”