How to tag properly "Rowerowy tor ekstremalny"?

I know 2 places in Wrocław, which are pretty similar:

Photo examples: Rowerowy tor ekstremalny, ul. Agrestowa, Wrocław - polska-org.pl

I think sport=mtb describes such places better than sport=cycling. But I have no idea about leisure tag.

What do you think, how is it better to tag?

pitch for ones forming an area, track for ones forming linear way.

Can you go across some area in any direction you like? Or do you follow some specified route?

I guess these can be within sports center or recreation ground or other similar object.

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In this area, you can go any direction by foot. But with a bicycle, there are probably limited ways to follow.

These 2 are standalone, surrounded by trees, there are no any sports center.

I think the best tag is cycling=pump_track, like here: Way: ‪pumptrack‬ (‪526804176‬) | OpenStreetMap, + surface=ground.