If you hold any smart watch in your hand and rock it backwards and forwards once per second you will fool it into counting steps. You can try this with a fitbit or AmazFit bip etc.
The step counter is not trained as such. It uses combination of filters, thresholds and finite state machine.
This entire thread will tell you how to make calibrated accelerometer recordings that can then be used. There are also posts that explain how the algorithm works.
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