Matt will be running in aid of The Welsh Charitable Trust, and said: "We've all recently enjoyed watching Wales' Grand Slam triumph in the Six Nations.
"But unfortunately every year there are a number of players at all levels of the sport across the country who suffer serious injuries while playing the game we love.
"If you could please spare any change to help support this worthwhile charity that would be fantastic."
It is sad to note that there are currently 20 former players who are permanently confined to wheelchairs as a result of accidents on the field of play.
The Welsh Charitable Trust has, over the years, provided cars, wheelchairs, both electric and manual, hoists, adaptations to homes, scholarships and, in fact, anything that can make the lives of injured players more comfortable.
Matt warmed up for his Marathon by being one of the lucky 5,000 people who were chosen at random to take part in the National Lottery Olympic Park Run on Sunday 1 April. The five-mile trial run around the London 2012 Olympic Park finished with a lap of the track in the impressive Olympic Stadium.