ARTICLES
Erik BerggrenMedicine long assumed the immune system couldn't be voluntarily influenced. A landmark 2014 study using cold exposure training proved otherwise. Here's what actually happened.
Erik BerggrenSleep and training aren't the only two levers for growth hormone. Finnish research on heat exposure found a third — here's what the studies actually measured.
Erik BerggrenCaffeine blocks the signal that tells your brain you're tired. Cold exposure spikes norepinephrine directly. Here's the real mechanism behind the difference, and why only one crashes later.
Erik BerggrenAging is usually described as something that simply happens over time. A more precise way to think about it: your cells constantly produce proteins, some of which fold incorrectly, and your body normally clears these damaged proteins out. Over decade