Smartphones are good for one thing and one thing only. Games. Okay, that's not entirely true but it is a fact that we're all constantly playing games on our phones. Why not turn that idol time into productive time? Use games to get in shape with the Stealth Interactive Core Trainer. The team behind Stealth believes that you shouldn't have to waste the day away training your core. They feel that they can kick your ass in under 3 minutes with the fitness-focused app game. This system is able to deliver unpredictable, effective, fast workouts each and every time. With 3 minutes a day you'll boost your energy, improve your posture, and you'll feel better all-around but you don't have to limit yourself to just those couple minutes.