There's also hyperbaric oxygen, which is where you go down to two atmospheres or more. And that induces all sorts of benefits of the body in terms of stem cell generation. But it also seems to kill zombie cells. Zombie cells are not really dying, but spew out inflammation and infect other cells. The shorter your telomeres, these little end caps that protect your chromosomes shorten as we age. So when you can lengthen them, you actually improve longevity.