I'm not sure if this is really a problem, but I feel like it's a *thing*. Say you train (live) at altitude and you become really good at training with perceived effort. Then you go down to sea level to race. How is your perception of effort affected? Probably for short/fast races, not at all (you're just going all out anyway). But what about long distances, where you have to be more careful about parsing out your resources over many hours?

I'd be interested in hearing from people who train/live at altitude, and how they feel their perception of effort changes at sea level where things feel 'easier'.