Judith Hygate has run on Gambian roads, through wintery conditions and clocked up nearly 300 miles this year - all to raise money for eye research.
Judith, 49, has been a member of the Wombwell Running Club for two years and has taken part in four half marathons but will run the London Marathon this year.
The systems and data analyst is running the 26 miles for charity Fight For Sight after her partner Paul Kippax suffered complications with an eye operation in 2010.
She says training is going well for the event on April 21, which will be her first marathon race.
Paul, 42, suffered a detached retina - the light-sensitive layer of tissue at the back of the eye, which Judith, 49, said can occur as people get older.
He needed an operation to reattach it but he still has oil in his eye from the surgery to keep his eye in place.
She says Paul has restricted vision in his eye and makes sure he takes care of the one he has full vision in.
"If Paul lost sight in the other eye he would be in a poor state," she said.
"I hope that in the next few years there will be scientific advances to restore the sight he has lost. Fight for Sight seemed the logical choice for me."
Judith, of Birchin Bank, Elsecar, even managed to fit in a run on a two-week holiday in Gambia and has also been making and selling cakes and biscuits complete with her printed marathon logos on the icing.
To sponsor Judith go to http://uk.virginmoneygiving.com/JudithHygate