It's not a question of How, it's a question of Why.
And if you ask Cyrus why he performs the feats he does, the reply is always the same.
"People will watch and I don't want to work a 9 to 5"
Cyrus has a BA in Theatre and an arsenal of bladed weapons. Put those together and you have some Cutting Edge Entertainment. Swords, Knives, Whips; easy to confuse Passion with Obsession in Cyrus' case, and rightly so. He's a man of skill, a man of danger, and some would say....a complete lunatic. Particularly in his mastery of the skill of Sword Swallowing.
Despite his seemingly masochistic stunts, Cyrus strives for one thing the most. The Entertainment of Others. At the end of the day as long as the audience has enjoyed the show he considers his job well done.