Yoga has not only therapeutic value. Actually, yoga was designed to build stamina so that spiritual seekers did not waver from their goal. So, though the initial value of yoga in your life may be therapeutic, as you advance in your practice it will contribute immensely to your physical, mental and emotional stamina.
The ability to hold your pose without wavering and with steadiness is called asana jaya (victory over the pose). Such steadiness requires strong muscular and respiratory support. This steadiness also arises from the yogic mental ability to analyse pain and understand whether it may be borne or is dangerous. This special ability is peculiar to yoga, which is why it is regarded a perfect pain management tool.