Gain Fitness, a startup that creates personalized workouts based on certified trainers’ expertise, is launching an iPhone app today to allows fitness enthusiasts to access programs on the go. Founded by former Googlers, Gain Fitness launched to give users personal trainer quality exercise without the hassle of researching workouts or booking expensive trainers. Not you gain bring these workouts into the gym with the Gain iPhone app, which costs $2.99 in the App Store. The app features 700-plus exercises (strength, plyometric, callisthenic, yoga), and unique workouts, custom-tailored to you. The startup is also announcing that Crunch Fitness founder Doug Levine has also joined its advisory board.