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Pumping is definitely not free. Try back to back laps on a pump track and see how you feel. It's hard work.
This in spades, I've been going to the pump track and if I do back-to-back laps I'm totally fucked after 30 minutes.
I agree that this is a skills challenge, but you need fitness to be able to use your skills for the whole descent - if you're gassed at the halfway point you're a passenger for the rest of the section.
Bear in mind that for Enduro you also need to ride between the stages, so whilst that isn't timed you do need to complete it within a time, and then have enough left to ride the stage.
This in bundles. Despite being a large lump I can get up hills faster than quite a few of the people I ride with. However their skills more than compensate on descents. They can pump to get free energy when pedalling isn’t possible, better cornering skills mean they slow down later, enter with greater speed and can pump out of the exit. Etc etc etc. @dammit I imagine your cardio is quite good so skills and dynamic explosive strength might be areas to aim for.