Have you ever done planks before? They can be pretty tough sometimes, almost to the point of excruciating abdominal pain. Well you know what they say "Mind Over Matter"; what better way to practice this than distracting your mind from the pain. The 'Stealth' fitness app does just that, it comes with a board that has a slot for your phone so that you can work your core but look at your phone at the same time. The game allows you to keep your mind focused on scoring points while you are getting a nice core workout. It's a pretty simple concept but very inventive. The Stealth Interactive Core Trainer is available now for pre-order for $179 and ships in June 2017. Check out the video below to see how it works and pre-order here if you're interested.