I didn't know about any of these:

While one study correlated 30 consecutive days of cold showers with a 29% decrease in sickness, another found a metabolism spike through brown fat activation. Yet another study found repeated cold exposure to harden your stress tolerance.

The wildest finding yet? Up to a 530% and 250% spike in concentrations of feel-good hormones like noradrenaline and dopamine, respectively!

Thanks, man.