I suggest trying a workout or two per week at a climbing gym (or on real rock). You don't even need to rope up, just 'boulder' around a couple of feet off of the ground. It's hard going at first, but much more fun than dangling helplessly from an unforgiving overhead bar.
The added plus is that this will also help you build overall core and leg strength, as well as increase your caffeine levels (if the gym also has an espresso bar onsite).