Natasha Darcy was so ill before she received a double lung transplant that she couldn't even walk her kids to school.
But now the 34-year-old is getting ready to take part in the Vhi Women's Mini-Marathon to support the work of Cystic Fibrosis Ireland.
Natasha, who's mum to Niamh (8) and six-year-old Oisin, was diagnosed with cystic fibrosis when she was a year old.
Her condition eventually deteriorated to the extent that she had to go on the waiting list for a lung transplant in February 2013.
Natasha was getting a lot of chest infections and was on oxygen all the time.
"When I wasn't in hospital I spent a lot of time at home on the sofa with oxygen and just not being able to breathe," she said.
The children had to give up their after-school activities, said Natasha, who lives in Leopardstown.
"I was too tired in the evenings to do things. We did a lot of movie watching and stuff at the weekends so I could catch up on rest," she said.
But her life changed in November 2013 when she underwent the double lung transplant at the Mater Hospital.
Natasha is now making the most of her new lease of life and enjoying lots of activities with Niamh and Oisin.
"We have no TV during the week. In the last year now I've done loads of things that I never thought I could do with them, like going for cycles," said Natasha.
"The first thing I wanted to do was walk the kids to school. It was only down the road, but we used to have to drive."
Natasha is now getting ready for the mini-marathon on June 1.
Cystic Fibrosis Ireland yesterday unveiled its "one in 1,000 campaign" looking for women to come together and raise vital funds by taking part.
Fine Gael TD Aine Collins, whose six-year-old daughter Lily is living with cystic fibrosis, will be offering her support.
"Our family is so lucky in that Lily is fighting fit and enjoying life to the fullest as every young child should," she said.