Im a lifelong runner in my 40s. I outdistance and outpace runners half my age. Ive incorporated technology as a training tool since the beginning of heart rate monitors. The MAJOR flaw with most well recognized running apps is "bloat"--fancy interfaces, generic caloric burn meters, nutrition bots, cameras, advertising, graphs and charts (Okay, some data useful). "Fun runners" and "social runners" become slaves to their phone apps. Hey, if it gets you motivated and keeps you active, great! But this app is the opposite – clean, lean and only the necessary information for serious runners. I consider this app among the top three of all running apps in the entire App Store. Perfection!