At the end of your shower, blast your body with COLD water for 30-seconds. It’ll feel shocking at first… But afterward, you’ll feel invigorated. Columbia University researchers say the cold blast will trigger your body to conserve heat by moving blood away from your skin toward your core – to protect your internal organs. And that can induce a racing heart and shortness of breath, which boosts your metabolism and produces energizing happiness-boosting endorphins. It’s like a cold-shower-high, and it has an antidepressant effect.