Brenda O'Keeffe has already run a laudable 96 marathons in 2015, but that's not enough.
She aims to break the Irish record - for a man or woman - of 104 marathons in one year.
Brenda, a chef originally from Cavan, spoke to the Irish Independent about the provenance of her marathon obsession.
Back in 2009 I was in a bar in Dublin and all these ladies were celebrating finishing the 10km mini marathon.
I decided there and then I was going to do it the following year.
Not only did I run the 2010 mini marathon, just four months later I ran the full Dublin city one and six days after that another in Berlin.
This was only the beginning, the beginning of something that would change my life.
Last year I ran the most marathons run by a woman in Ireland in a calendar year - 74. I have already broken that record this year and am aiming to complete 106.
That will be a new Irish record for a man or a woman.
Last year, Brenda ran 74 marathons and this year has her eyes on a total of 106, which would break the record of Dave Brady, who she labels her 'hero'.
There is also a charitable aspect to Brenda's enthusiasm for running.
She plans to run 120km from Croke Park to Cavan town this Christmas and in the process raise money for two good causes - Cavan Cystic Fibrosis and Care For Cian, a charity which raises money for the son of her friend who has a serious illness.
For the last couple of years my Facebook status at Christmas has been Driving home from Christmas so that gave me the idea and I've mapped a route from Croke Park to Cavan town. It's about 120km.
I'm hoping to do it in about 15 hours.
I will leave Dublin at 9pm on the 23rd and hope to be in Cavan town by noon on Christmas Eve.
You can find out more about Brenda on her Facebook page.
Picture credit: Brendan Moran / SPORTSFILE