Although the training takes lots of energy and time, it needn't be driven by striving towards abstract goals. Rather the training can be a playful/fun practice for the sake of doing it well in the moment. This makes it feel easier to practice a lot, and also makes the practice more "productive" by freeing up attention from distractions of purpose and self.
It's hard to say if most elite athletes are able to do this all the time, but they probably don't have as bad a time of it as normies when it comes to physical exertion.