My parents wanted a bench to go with the concrete fire pit I made for them. I decided to reuse the wooden forms from that project to make a bench. The bench consists of 2 blocks of concrete made from Quikrete 5000 and three 8-foot long 4x6s that I got from home depot. Four 4x4s would have worked just as well. I did this project in southern California so frost heave isn’t a problem, which is why I was able to do it without digging deeper. The wood isn’t actually attached to the concrete but rather sits within recesses in the concrete blocks. I am thinking about making the bench L-shaped in the future so I wanted to be able to disassemble it if needed.