EDIT: So basically heres what it claims:
-Your body burns fat more effectively, fat may be redistributed and burned as energy during the class. It is common to lose centimetres of shape in a very short time
-The heat produces a fluid-like stretch allowing for greater range of movement in joints, muscles, ligaments and other supporting structures of the body
-Capillaries dilate in the heat; more effectively oxygenating the tissues, muscles, glands and organs and helping in the removal of waste products
-Your peripheral circulation improves due to enhanced perfusion of your extremities
-Your metabolism speeds up the breakdown of glucose and fatty acids
-You benefit from a strengthening of willpower, self control, concentration and determination in this challenging environment
-Your cardiovascular system gets a thorough workout
-Your muscles and connective tissue become more elastic and allow for greater flexibility with less chance of injury and improved resolution of injury
-Sweating promotes detoxification and elimination through the skin - which is the body's largest eliminating organ
-Just as when your body raises its temperature to fight infection, the raised temperature in the room will assist in improving T-cell function and the proper functioning of your immune system
-Your nervous system function is greatly improved and messages are carried more efficiently to and from your brain
-Metabolism improves in your digestive system and in the body's cells (that is food in the gut and nutrients in the cells)