I saw this article posted, and believe it's important to address the assertions made here.
While I agree with this article in principle, I disagree with the fatalistic view of the fitness tracker space. It’s true that companies like Fitbit focus on intrinsic rewards that, by nature, decrease extrinsic motivations. However, this problem is not in the product itself, but rather the implementation of the product. I have spoken about this at length here.
Research has demonstrated that fitness trackers, such as Fitbit, can have positive effects on short-term exercise behavior. The article agrees with that point—for most people, increasing awareness of physical activity patterns can help to increase exercise behavior. However, once the initial novelty wears off, these products do little to encourage long-term exercise adherence. That doesn’t mean we should give up on them wholesale.