What do you think about Garmin's Running Dynamics?

In the right context they've got a role, largely about informing drills and training decisions.

Cadence is quite helpful in terms of understanding how my fueling is working. It's probably the most useful, although assumes fairly flat routes. It's essentially meaningless on my race data as they're all on trails.

Correlation with mapping data it's easy to see how different environmentalists have an impact.

I wouldn't see them as particularly useful for the majority though.

Interesting, limited usefulness. I've got the most use out of things like ground contact time balance when I'm recovering from injury; how the numbers read in balance is an indicator of how injured/recovered I am on one side. That gives me a clue as to how much I need to limit running during recovery from injury.

Everything else, at best a readout of where I am. I don't see much of anything in the running dynamics that I can focus on to improve, but I see several indicators that can show better or worse fitness or form.