The previous owner of our property ran a dog boarding business and as part of his setup, he built a nice fenced-in area behind the house. It's a livestock-style wire fence with large wooden posts — some are eight inches in diameter — sunk deep into the ground. Since I'm not running a dog boarding business, I don't really need (nor do I want) this fence. I'd rather open things up to give the property a more free-flowing feel. But how do I go about pulling these posts, each of which may weigh 50 pounds or more and are sunk three to four feet into the ground? Physics to the rescue.