If you have a rotting fence post that needs replacement, here's how to get the concrete pier out of the ground.
It's not complicated, but you'll definitely work up a sweat. First, dig a semicircular hole the same depth as the concrete, around one side of the pier. Make the hole large enough so you can get a good swing at the concrete with a sledgehammer. When about half the concrete is broken off, you and a helper should be able to lift the post out of the hole. Sometimes the post breaks off during lifting. In that case, tie a rope around the pier to lift it out.