These refer to the inhale:exhale ratio of two breathing patterns.
2:4 breathing is where you inhale for 2 beats and exhale for 4. 2:4 breathing is great for calming the nervous system, improving digestion, and relaxing deeply.
4:4 breathing is where you inhale for 4 beats and exhale for 4. 4:4 breathing triggers self healing and it helps you to feel simultaneously relaxed and energised.
Both of these techniques help you to feel really good when you practice them for at least 5 minutes at a time. Because SOMA Breathwork is done to music, it is really easy to maintain a consistent rhythm.