The Cat and Cow Asana (or in my order Cow and Cat) is one of the fundamentals of Yoga. This exercise is extremely refreshing and good, especially for your back.

How to: You start this Asana in the Four Point position (the two hands and the knees as your points). When you breath in through your nose you bend your back inwards with your belly pointing to the ground. Your head moves towards the ceiling meanwhile. When you exhale you reverse the movement pointing your back to the sky and the head in between your shoulders. You repeat the movement 12 times.

Information retrieved from Redbull.