(Reuters) - For fitness enthusiasts who can't make it to the gym a web-based app will bring group video classes, and some friends for motivation, to them. Wello, an app that connects users with personal trainers for video-based workouts, has launched group classes for a range of activities, including yoga, Taekwondo and high-intensity interval training. Classes are led by certified trainers and are accessible to anyone around the globe with a webcam and an Internet connection. ...