Is cryotherapy why Justin Timberlake and Jessica Biel *never* seem to age?

If you haven’t noticed, Justin Timberlake and Jessica Biel have a pretty wild Benjamin Button thing going on: As they get older, they only seem to look better and better. Maybe they secretly found the Fountain of Youth and drink from it after every sweat sesh, but there is a more likely explanation for the agelessness: Their obsession with cryotherapy.

The duo reportedly frequents Quick Cryo in New York City. In fact, according to Page Six, they hit up the hot—or, er, freezing—spot every other day whenever they’re in the area. But what exactly does the Japanese-developed treatment entail—and how the heck does it do so much good on the longevity front?

After spending just a few minutes in a subzero-temperature tank, you may reap benefits that include burning as many calories as you would in a spin class; reducing inflammation and muscle pain; recharging the adrenal glands, giving the body a boost in mood, energy, and athletic performance; and helping you sleep better. Still, keep in mind that the treatment is not FDA approved and does expose customers to risks like frostbite.

“The effects on your skin basically are immediate—you get the healthy glow, improve circulation, and then with time, because of the boost in collagen, you see lasting effects in the smoothing of the skin tone and reducing wrinkles.” —Joanna Fryben, co-owner of KryoLife

Of course, aside from the body benefits, the anti-aging component could totally be a reason the healthy couple flocks to the treatment. “The effects on your skin basically are immediate—you get the healthy glow, improve circulation, and then with time, because of the boost in collagen, you see lasting effects in the smoothing of the skin tone and reducing wrinkles,” Joanna Fryben, co-owner of KryoLife in New York City, told Fox News.

And why not take a note out of Timberlake and Biel’s healthy-relationship book to give it a try? Cryotherapy dates might, after all, be just the wellness activity to shake up your romantic infrared-sauna-sesh habit.

Find out the do-anywhere yoga class Jessica Biel swears by. Or, check out the super-sporty way she celebrates good news.

This story was originally published on March 22, 2018; it was updated on July 10, 2018.