They offer everything from real-life footage to immersive augmented reality and engaging gamified worlds. When the rain is lashing down and dark evenings are closing in, many of us are now eschewing the outside world and instead opting to climb onto a turbo trainer, plug into a laptop or tablet and explore the digital highways, which have come a long way from the early days of bad video quality, pixelated avatars and mind-numbingly dreary routes.