Author here: funny you should mention that! Same idea has been on my mind for years at this point.
To me, the holy grail of sports training is to have simple but powerful enough models to estimate power data from dozens of movements, and fit various power curves that match real-world training.
So much promise there.
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As for Stryd: That's so interesting. I'd imagine a lot of the same parallels to cycling to apply? Once you have your running CP/FTP, I'd imagine you could follow the same cycling training plans (relative to your FTP) for the same intended stimulus.
I'm curious though, can you see the Watts/zone/W'bal/etc. values on a watch or something when you're running?