Some Shingon monks in Japan practiced Sokushinbutsu (即身仏), which caused their own death by adhering to a wood-eating diet consisting of salt, nuts, seeds, roots, pine bark, and urushi tea. They were then buried alive in a pine-wood box with the only opening being a tube for air, meditating in lotus position and occasionally ringing a bell to signal they were alive. When the bell stopped ringing, the box would be dug up and treated as a buddha, granting favor provided it was preserved.
It’s not just meditation, but it’s also a strict diet. https://en.wikipedia.org/wiki/Buddhist_mummy
Yeah, no thanks
Christianity is so much more wholesome, with the torture, human sacrifice, cannibalism, and whatnot.