Mudbox was crashing a lot today so I couldn't work on my personal project (which was a little fox character) so I decided to start again using one of the default models. I felt like making a deformed zombie character, so I started with the human body model, but I wasn't happy with the default pose it had. I wanted it to be hunched over so I messed around with the posing tools. I managed to create joints in the model and move the body into a new pose using those joints. This worked well and I have done more progress on the model than what is shown in the screenshot, but Mudbox crashed just after I saved it and it refuses to open that scene without it crashing again.