When I trained for Ironman there were some who thought I was mad. The one-day, long-distance triathlon was a feat of physical endurance that required several training sessions a week.
It was an all-consuming period with little time for anything else outside work, training and sleeping.
Compared to what Scott Donaldson has been doing, however, it was a stroll in the park.
Donaldson, who is an asthmatic, has wanted to cross the Tasman Sea for many years.
Initially he wanted to row one way and kayak back - the mission was called Double Ditch.