Gavin York has set himself a two-part challenge - to cycle 1000km in September and raise $1000 for Alzheimers New Zealand.
He reckons he will smash his first goal, and for the second he's seeking your help.
The 64-year-old is taking part in the fundraising Move for Dementia; September is World Alzheimers Month.
He is a diversional therapist at Marion Kennedy Centre in Roslyn, which provides social groups for people with dementia and respite for carers.
York started cycling three years ago and considers himself a novice cyclist. Five years ago he had an accident and broke his knee. It still troubles him, and running and walking are not good for it. He says with cycling there is no pressure on the joints if your bike is set up correctly.