The more fundamental problem with most fitness apps is that <i>they measure the wrong things</i> and <i>the fitness protocols they promote aren't effective</i>.<p>A piece featured on HN some years back was the Men's Journal article "Everything You Know About Fitness Is a Lie"<p><a href="http://www.mensjournal.com/magazine/everything-you-know-about-fitness-is-a-lie-20120504" rel="nofollow">http://www.mensjournal.com/magazine/everything-you-know-abou...</a><p>At its heart:<p>_[N]othing on Earth beats the fundamentals, a commitment to regular, measurable improvement in everything that a gym trainer won't teach, for fear you'll walk away bored: push-ups, pull-ups, bench presses, squats, dead lifts, and even such military-seeming tests as just how fast you can run a single mile._<p>... that and a slew of perverse economic incentives for gyms, personal trainers, and now, "fitness apps".