Kaitaia man John Somerville might well have been thinking of his GP on Saturday as he jogged across the half-marathon finish line at the World Masters Games in Auckland.
It was Dr Norma Nehren, at Te Hiku Hauora, who informed him some four years ago that the then 77-year-old could consider himself pre-diabetic.
It was never going to be a matter of avoiding diabetes by losing weight - John has never had much, if any, weight to spare - but the spectre of serious health problems was all the encouragement he needed to get to work on his fitness.
Now 81, he showed what he had achieved when he ran in the half-marathon on Saturday, finishing about halfway down the field of 109, fourth in his age group, in a time of 2.53:08.
And he hardly broke a sweat.