Wellness and technology, the quantified self movement

In general we know that lifestyle changes such as eating right, exercise, and not smoking are good for you, do you really need to spend more money to reiterate that?

Again, that question can be levelled at anyone using Strava, Fitbit, etc, etc. But yet people still feel a personal benefit, for focusing their exercise, or mitigating risks, or motivating themselves, such that they are prepared to measure and apply learning from the outcome of such measurements. Which is what the thread is about.