Four Australians are preparing to take part in the annual Mongol Derby, a 1000km trek labelled the world’s toughest horse race.

Henry Bell and his three cousins are raising money for Multiple Sclerosis, riding for Henry’s father Rob who suffers from the worst form of the disease.

When Rob was younger he was a fine horseman, so his son and nephews are hoping to do him proud and help find a cure.

Rob joins Alan Jones and says his diagnosis in 2011 came as a complete shock.

“It was five years before I knew something was wrong…spent the next five years finding what was wrong… it’s so cruel because it’s so slow.”

The Mongol Derby is no easy feat.  The world’s longest and toughest horse race will take the men up to 10 days to complete.

It recreates the horse messenger system developed by Genghis Khan in the 13th century.

Henry is a good rider but tells Alan he signed up without knowing how hard it would be.

“I don’t really know, we sort of signed up for it before we really knew what we were getting into.”

“Doing it with my cousins, and I think it will be really exciting.”

To listen to the full chat, click PLAY

To donate to ride for a cure, and help raise money for MS, click HERE