Yahoo TV

When David Adams lost his sight completely eight years ago, even lacing up his boots became a challenge. But with Labrador Jimbo and climbing guide Charlotte Paynter, he's reaching new heights by climbing Marston Hill in Warwickshire. So far, the team has climbed the hill almost 200 times. By this weekend, they'll have reached the equivalent of the Himalayan peak in what will be the first time a guide dog has climbed the equivalent of the height of Everest. And it's all for good causes. David is hoping to raise one million pounds for three charities - a target started by his son Simon who died of motor neurone disease 10 years ago.