Exercises in breath control, such as breath retention and deliberate methods inhalation and exhalation for specific mental and physical benefits are at the core of pranayama practice. (verywellfit.com)
The Sanskrit word asana refers to the practice of the yoga postures and there is plenty of research now to show that a regular asana (as well as pranayama practice — which refers to the movement of prana, or «lifeforce» through breath control) practice can help to lower blood pressure, increase circulation, ease stress, alleviate the symptoms of arthritis and osteoporosis, reduce back and joint pain, etc, etc.. (mindbodygreen.com)
Surya Bheda Pranayama or Surya Bhedana Pranayama is one of the main pranayamas practiced with Kumbhaka. (yogicwayoflife.com)