As the scale of her work and its influence has grown, Power's propensity for testing her physical limits has grown with it.
She is now the holder of two Guinness world records - becoming the fastest woman to run the length of Ireland, last year.
Power completed the gruelling 340-mile route in three days 12 hours and eight minutes, smashing the previous record set by Mimi Anderson by more than three hours.
The route took her through Munster, where husband John was born, and to County Cork, where many of the Power family live, running through torrential rainfall, experiencing the early stages of sun stroke and sleeping for little more than two hours, while sustaining herself on a diet of jam-filled tortilla wraps, gels, chews and ice cream.
Her tongue was burned after two days of eating nothing but fruit and sweets. She pushed herself to the brink of total exhaustion.
"I was seeing nativity and Christmas scenes everywhere in this town. And all the trees had turned into plastic. The hallucinations were phenomenal, crazy," she said.
She has since gone on to set a second world record for the longest distance covered on a treadmill by a female in 48 hours and will be hosting her own women-only ultra races in the Peak District in August.
So how will she know when she has achieved what she set out to do?
"My ultimate goal for SheRaces is that we don't exist because it's not needed anymore and every woman is able to get on the start line," she added.
"Part of the reason I created it was to have something that wasn't just me and was owned by all women. We can all help each other and demand fairness."