Mild cold stress, defined as water at 80°F or air at 60°F, can initiate metabolic and hormonal responses.

“So, mild cold stress, when I talk to people, first of all, I don't think people really don't need to be doing ice stuff right now. I mean, it's just, there's way more risk and you can get a lot of benefits above it. So, what I always tell people, because I think everybody goes to the extreme and the fitness industry is the worse about this. But basically, the guidelines I give to people is this, it's that mild cold stress begins at 80F in water, okay. And it begins at 60F in air. So, that's where you start seeing a change. You start seeing a metabolic response, you start seeing a hormonal response at about those temperatures.”