Or have significantly higher lean body mass than a Tour de France rider, since lean body mass is pretty much a multiplicative factor in energy consumption.

> Tangentially, there are oodles of Youtube videos about the diets of professional dancers... who practice 6+ hours a day... and none of them are even breaking 3k calories.

The thing about being a serious amateur dancer is you can be much bigger (both height and frame) than you could be and ever hope to go anywhere professionally in most styles of dance, which professionally tend to very rigorously filter for a very narrow range of body types (even, e.g., in ballroom, though classical ballet is the most notorious and perhaps the most extreme for this.)