Your Stress response is designed to keep you safe. It gives you a surge of adrenaline and energy, so if you’re ever in danger you can to respond immediately (fight or flight). But modern life has far fewer real physical threats than your ancestors had to contend with.
Today you’re more likely to turn on your stress response just by thinking (autosuggesting). And you can keep it turned on by worrying, multi-tasking and rushing around like a crazy person – which depletes your energy and makes you feel exhausted. Many mindfulness practices turn off your stress response by activating your rest and repair system, leaving you feeling calmer, more relaxed and in control.