They are creating ebike categories to run together with XCO style races over here.
Last november, I made a mistake and had my battery end before the last 4 kilometers, wich happened to be a 20% 3km climb where I had to walk uphill for half an hour, triggering a knee pain plus a golfer's elbow pain that lasted until last week.
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Then, last sunday I came back, and prepared for the worst, carrying a spare 3kilogram battery on my backpack, just made another little mistake... on this course, the first climb up a 1.000 meters summit had a sigletrack, very technical, wich I could clear, if only there wasn't 100 bikers walking their bikes and clogging the course, so another half an hour pushing the bike uphill, only now with an extra 3 kg

This made my heart hate stay above 165 for almost two hours, way more than my cardio would consider a healthy threshold.