• stoy@lemmy.zip
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      8 days ago

      Neither is a major source of heat here, most of this is friction, the running mat drags against a static surface and with the weight of a human on it it has a LOT of friction and that generates heat.

    • Trex@lemmy.world
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      8 days ago

      I’d say that all of the yellow on the tread is friction from running on it

    • bdonvr@thelemmy.club
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      8 days ago

      Probably friction from the fact that it has to constantly slide while being pressed into the plate under the tread with the force of an adult human.