In New Zealand, the Maori people have an ancestral war cry with a dance called “haka” that was originally performed by warriors before a battle. A show of strength and battle prowess, it was used as a form of intimidation against the enemy. Traditionally, the dance is performed by a group and involves foot stomping with rhythmic shouting.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.