The breathing technique in Reusi Dat Ton (aka Traditional Thai Yoga) is typically a form of Abdominal Breathing combined with breath retention, and traditionally a type of applied Tibetan Vase Breathing.
Nevertheless, apart from the way one usually applies breathing in Reusi Dat Ton exercises, the system also contains some distinct breathing exercises which are applied for their own benefit, and not as an aid for other exercises.
These special breathing exercises are in fact genuine Breathwork, which — in the context of ancient exercise systems — are perhaps better known as Pranayama, a common term used in the Indian Yogic practice of breath control.
Traditionally, there are various aims for breathing exercises. For instance, they can be used to acquire deep concentration abilities, subsequently followed by meditation practices, with the ultimate goal of attaining higher levels of spiritual awareness, spiritual insight or enlightenment.
They can also be used to control and direct Vital Life Energy (called Lom Pran in Thailand) to specific parts of the body for therapeutic healing, among other applications.
In a more down-to-earth practice, Breathwork may be used for stress and anxiety relief, as a means of mindfulness, better concentration and improved cognitive performance, improved sleep quality, or lower blood pressure, to name some common aims.