Okay so we started this episode asking the hard-hitting questions — would you rather give up caffeine or social media? And Caleigh's answer might tell you everything you need to know about her. But then we got into the actual topic, and it's a good one: testosterone. Not just a "man thing." We both have it. We both need it. And a lot of us are running low without even knowing it.

Sara pulled her actual Function Health results on air and her total testosterone came in at a 7. Optimal range? 15 to 47. So we got into what that actually means: the fatigue you brush off, the brain fog you chalk up to being busy, the muscle tone that just isn't responding the way it used to. Plus we busted a few myths — including the one that says you need TRT to build muscle after 40 (you don't, for most people) and the one that says low ...