'You fall you're dead,' the voice inside my head told me. I was balancing on a knife-edge ridge, sheer drops either side of me. The cold was chilling me to my core. But I could not give up. I had to focus, The summit was within reach. On May 24 2007, Tori James made history when she became the first Welsh woman, and youngest British woman, to climb to the summit of Everest, the world's highest mountain. It was another record-breaking achievement for the petite farmer's daughter from Pembrokeshire, who first entered the record books as a member of the first ever all-female team to complete The Polar Challenge, a 360 mile race to the Magnetic North Pole. In Peak Performance Tori shares the inspiration and drive that helped her to succeed. Her story will inspire you to meet new challenges and aim for your own personal goals.