Next time that happens, try calming yourself down with a soothing round of " resonance breathing." This technique, popular on TikTok and beyond, is about breathing in and out at the same frequency. Instead of gasping for air, holding your breath, or breathing unpredictably, you inhale for five seconds, exhale for five seconds, and focus on maintaining a rhythm. Sometimes called "coherent" or "resonance frequency breathing," the method is just that: taking equally slow and more even breaths, says Chloë Bean, LMFT, a somatic trauma therapist in Los Angeles.