A Christmas present saw a Sheffield man quit his job as a design and project manager and retrain as a personal trainer.
Ashley Arundel, aged 34, bought his father Neil, 59, a ticket to take part in a sprint triathlon in a bid to bring them closer together.
After both finishing in second place in their age groups, they were spurred on to take part in more triathlons.
And Ashley was given the confidence to quit his job as a design and project manager and retrain as a personal trainer.
He now works at PureGym in Millhouses where he has refound his love for work.
This year the pair entered their toughest challenge, the IM70.3 Iron-man on the Canary Island of Lanzarote.
To make it more of a family affair Neil’s brother, Martin, of St Albans, and Ashley’s future brother-in-law, Andrew Howard, from London, also went along.
Martin is already an accomplished cyclist, so relished the opportunity to add swimming and running to his repertoire, with the help of his nephew.
Ashley, of Shalesmoor, said: “A few years ago I bought my father and I an entry to a triathlon, but never dreamt where it would take us all.
“To top it all off we are now closer than ever.
“Taking part in the IM70.3 Iron-man with my family by my side was an incredible thing to be a part of.
“We struggled through it together and all enjoyed the experience, having the rest of our family there to cheer us on was phenomenal.”
Neil, of Doncaster, topped his age-group in Lanzarote and qualified to represent Great Britain for the Middle Distance Triathlon competition in the USA.
He will also represent GB in the European Sprint Distance Triathlon in 2016.
Ashley finished as the fourth fastest Brit.
Allan Brady, PureGym Sheffield Millhouses general manager, said: “Having Ash as part of the team here is fantastic.
“He has a great back story about why he chose to change career which I’m sure will inspire many of his clients.”