The world of John Wick is cold, ruthless, and unfriendly. But Natalia Tena felt only love as soon as she walked onto the set of John Wick: Chapter 4.

“I am kind of a small character in this massive franchise, coming in at the end. And I just felt utterly welcomed,” Tena tells Inverse. “It’s just that the warmth with which they welcomed me, I felt like I was the lead.”

After leaving footprints in other mega-sized universes like Harry Potter, Star Wars, and Game of Thrones (where she played fan-favorite wilding Osha), Natalia Tena occupies prime space in the premier R-rated action franchise of the decade. In John Wick: Chapter 4, Keanu Reeves’ iconic assassin returns for his final stand against the shadowy organization, the High Table. To challenge them, John must make amends with a family of Russian Romani assassins he left behind.

When it comes to passing gas, it's usually a one-way portal. However, a therapy that’s been called a “reverse fart” has been breaking wind since actor-turned-wellness-entrepreneur Gwyneth Paltrow shared on the podcast “The Art of Being Well” that she’s puffed ozone into her o-zone in the name of holistic health.

So, what is rectal ozone therapy, and does it actually work?