No heavy phone in your pocket, no armband on your bicep, nothing of the sort. It's a way of running freely, listening to your own body, and gauging your effort. Metrics are useful for tracking progress, reviewing what happened, forming hypotheses, and providing motivation to keep moving forward. But micro-managing every moment doesn't help with these goals.
Minutes per Kilometer aims to support this approach by offering a space where you can work on these aspects after your run.