Last year, 25-year-old Ben McDonald died suddenly of a heart attack at the finish line of the Cardiff Half Marathon.
Amongst the 27,500 runners racing through the city, Ben's family decided to walk the route in his memory.
Ben's mother, Ruth, said they entered the race this year as they didn't know how else to get through the day.
We're doing it to talk about him, to remember him, to walk in his footsteps. We just want everyone to know how amazing he was.
After Ben's death, his family chose to support the work of Welsh Hearts, who strive to install defibrillators and to offer heart screenings all across Wales.
The day before the half marathon, Ben's family and Welsh Hearts organised a heart screening for people between the ages of eight and 45 at Ben’s old school St Cyres in Penarth.
People of all ages came to be screened and donate money to the cause.
Ben had no history of any heart disease and he was fit and healthy, but hundreds die every year unnecessarily due to undetected heart defects.
To be able to carry on Ben's memory with such an important cause is fantastic and really means a to his family and friends. Losing someone close is an incredibly difficult thing to go through but it's comforting to know that it has helped start an initiative to save so many lives and save other families having to go through the same thing.