The video here walks you through a
breathing and mantra practice in 5 minutes to help you experience a profound sense of relief from stress. Just follow the prompts.
Pranayama is what the yogis of India call breathing full deep breaths. It's the practice of breathing to be more specific. One of the effects of proper breathing is immediate stress relief.
Chanting a word again and again (i.e. a mantra) is a common practice from Yogis to Buddhist monks to Christian choirs. The vibration of sound with a full breath of air relieves stress and focuses the mind thus functioning as a stress relief technique and a meditation.