You will begin to focus on the present and find more inner peace.  Yoga strengthens the heart, reduces pain and aids in weight management.  With the breathing- it helps to focus the mind, clean the lungs, increase circulation, to detoxify and strengthen.  The stretching helps in flexibility which prevents injury, reduces stress, increases stamina, turn your stress into sweat!  The quality of your sleep will improve and so will your self- confidence.  Keep in mind yoga has many more benefits than what is listed here.