What is the best thing to eat before exercising for energy and endurance? You need quality carbs, lean protein, heart-healthy fats, and fluids. Your muscles rely on carbohydrate foods like breads, cereals, pasta, rice, fruits, and vegetables for quick energy.
For other uses, see IOS (disambiguation). iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that presently powers many of the company's mobile devices, including the iPhone, iPad, and iPod Touch.
Yes, iOS is a closed system, compared with the open source Android. In other words, you can't install any software (apps) on your iPhone or iPad that hasn't been approved by Apple personally. Conversely, Android users can download and install apps from unknown sources, in the form of APK files found online.