[riialist]

What's interesting and per my present knowledge not yet explained is the fact that the modern Mongolian horse and Finnic horse are genetically and phenotypically the most related modern horse breeds.

As they say in the text, it is not the speed but endurance and resilience of the horses which makes the difference. Just try riding one of them. They barely notice you, until they decide to run. And after that it's like a train.

See e.g. https://gsejournal.biomedcentral.com/articles/10.1186/s12711...