Try a cold splash

Exposing your body to cold boosts brown-fat stores. “It’s brown because it’s mitochondrial-dense,” says Dr. Mercola. “And what do mitochondria do? They burn fat.” To get the perks, fill a sink with ice water and dunk your face for as long as possible; repeat daily. “It’s like a vascular exercise that improves neurotransmitter and mitochondrial function.” The result? Better focus and sunnier moods.