Now that's hardcore.
In a brand-new Fear Factor Mental Prep promo, two roommates say they got ready for the show by trying out a sensory deprivation tank.
"You can't see anything. You're floating, so you really can't tell where your skin ends and where the water begins," says 23-year-old Nathan, with his buddy George, 21, by his side. "And that can really play tricks on your mind."
Meanwhile, 18-year-old Gloria says she and her roomie Kristina, 19, "added a bunch of protein shakes and salads to our diet."
Kind of pales in comparison to the sensory deprivation tank, huh?
To find out how the other competitors prepared, watch the clip -- then catch Fear Factor Tuesday at 10/9c.