The new M8 motion coprocessor in the iPhone 6 and iPhone 6 Plus will continuously measure your motion data. A built-in barometer will measure your elevation based on air pressure, which is a notable improvement for fitness apps. Climbing flights of stairs, hiking mountains, and biking on inclines are all measured by the new iPhone technology.
The Health app in iOS8 will keep track of your data and integrate with third-party fitness and health apps. You'll be able to track food intake while focusing on nutrients such as protein and fiber, as well as measure distance walked, quality of sleep, how many stairs you've climbed, and lots more. The Health app can offer your health information instantly to your doctor and allows you to always have your Medical ID close by.