Hammock is a kind of sleeping device or bed hung between two trees. However, if you want to use the hammock just to take a nap or enjoy the day in the backyard, but there is not any tree to support the hammock, you can use the posts. Commonly, people use 4×4 posts to hang the hammock. The posts can be made of wood or metal. You can choose wooden posts if you want to create a natural feeling like to hang the hammock on the real trees. Besides, the sturdy construction is important too. You should make sure that the lower part of posts is buried with an adequate deep so it will make the hammock hung safely.