Tech for Health and Wealth

A new app called Bitwalking aims to generate a virtual currency by tracking how far you walk. We speak to the company's co-founder, Nissan Bahar. Plus, why should we trust our data to the "Cloud"? We ask the head of Amazon's Web Services business Andy Jassy. Presented by Rory Cellan-Jones with special guest tech broadcaster Georgie Barrat. (Picture: Three people fitness training. Credit: Thinkstock)