By maintaining a push-up position for several minutes with some variations you can find your way to a perfectly flat abs and strong core. This app will guide you through 10 increasing levels that will train your body to gain strength. No other physical exercise is needed when you can have different types of planks as plank makes every single muscle in your body work. Here you can come up with full plank elbow plank walking plank side plank and many more. Learn the correct technique and get your challenge.