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One of the best is the best back stretching exercises. It is also known as all fours stretch. This stretch works excellent for the whole spine. As the name suggests, one needs to form a posture like a dog or a cow by getting down on all the fours. While looking up at the ceiling, one slowly drops the back down towards the floor while inhaling. Again arch the back up while looking down at the belly button just like a cat. Now exhale. Repeat this stretch for another 2-3 minute.