In reply to Father Noel Furlong:
There's always the Stones Tribute hotel workout: couple of hookers, large bag of coke, throw the TV through the window and set fire to the bed. Repeat nightly until a major blood vessel pops, or your serotonin levels become undetectable.
The problem with most indoor workouts, though, is that they're generally being pushed by people who make money off them (I've looked into this myself, as I'm often stuck in one place on call for weekends and nights), so getting decent, objective advice can be near-impossible. I did go through a phase of isometrics, which definitely made me feel stronger, but did bugger all for my climbing. They're also really dull, and do little to give you a post-exercise buzz. I do suffer from a lack of focus with training, though.
If you're going to be cooped up, what about looking at getting an old Concept ergo? Get your heart rate up, blow off some cobwebs and maybe reduce the stress of being stuck in a room.