Ask Nigel Parker how many kilometres he ran yesterday, or how he slept last night, or what he ate for breakfast, and he won't just tell you but show you.
There's a histogram measuring his sleep levels over the past month, right down to average bedtime (10.30pm), average time to sleep, (12 minutes and 5 seconds), average wake-up time (6.47am) and even average sleep efficiency (89 per cent).
Also among his smartphone apps are bar graphs measuring average beer intake and a cluster chart of New Zealand mapping his running and walking activity: a big blotch marks the Tongariro Alpine Crossing, which he recently ran. There's a line graph, showing his live heart rate during exercise, which is recorded by an electronic band he wears while out pounding the pavement of Mt Eden.
The Microsoft executive is part of a new generation of motivated self-improvers - everything possibly quantifiable about his personal health, from the pH in his diet to the way he breathes, is crunched in what he calls the "data of you".
For the 38-year-old Auckland father of two, it all began four years ago when he developed the drunk-like symptoms of what he assumed was vertigo.
After seeing his GP and a neurologist, a physiotherapist suggested he undertake regular stretching exercises and break up his day with more periods of activity. From that point on, he made common-sense lifestyle changes - taking the stairs instead of the lift, running longer on his treadmill - but began wearing technology to track his progress.
He eventually blamed his "vertigo" symptoms on a lack of activity, bad diet and too many craft beers, and bought a device to measure every step he walked.
Last year, he redoubled his efforts with a goal to walk 4000km over 12 months and a radical diet change.
Mr Parker purged caffeine, alcohol and acidic processed foods and began measuring the pH in his food, balancing acidic foods with those more alkaline. He ate dinner early, tried to keep 12 hours for evening digestion before a morning meal, read up on sleep research, and lost 10kg in the process.