Yoga is a total mind and body work out that combines stretching poses with deep breathing mediation for relaxation.
Yin yoga is a slow-paced style in which poses are held for five minutes or longer. Even though it is passive, yin yoga can be quite challenging due to the long holds, particularly if your body is not used to it. The purpose is to apply moderate stress to the connective tissue - the tendons, fascia and ligaments - with the aim of increasing circulation in the joints and improving flexibility.
Hat-ha is a general category that includes most yoga styles. It is an old system that includes the practice of asanas (yoga postures) and pranayama (breathing exercises), which help bring peace to the mind and body, preparing the body for deeper spiritual practices such as meditation.