Why Doing Hard Things Makes Every Hug & Laugh Better (opens in new tab)

When you push through tough exercise or deliberate heat exposure, your brain adapts\. The mu-opioid receptors, which bind to endorphins \(your natural feel-good chemicals\), become more sensitive\. That means every endorphin you produce afterward hits harder and lasts longer, from the warmth of a loved one’s hug to the laughter from a good joke\.