@ gfire dude firstly Gimli was being sarcastic. It's one of the cock ups of the film making dwarves silly. A dwarf would of had more stamina than a man or an elf
-Anarion son of Eldarion.
Not that this is particularly relevant anymore, but that's actually not true. The movies took that line straight from the books, in fact, while Aragorn, Gimli, and Legolas are running to try to catch up to the uruk-hai that captured Mary and Pippin, Gimli actually asks Aragorn and Legolas to stop to rest for a while or to eat atleast like three times. I would have thought what you said too but its right there in the beginning of the first book of Two Towers.