The vast majority of us would do whatever we could for our friends when they need help, but Mairead spoke to Denise from Waterford who really went the extra mile.
Denise's friend Trina is currently living with Stage 4 cancer, and is raising money to receive pioneering treatment in Mexico which will prolong her life.
Denise wanted to help raise money for Trina, and set herself a challenge that saw her running not one but two ultra marathons in two days!
If you would like to donate to Trina's fundraiser, click here.
You can hear the chat in full by pressing the play button on screen.
