I have had been in bed for 4 days in bad spinal pain but yesterday dragged myself out to go to the local hydrotherapy pool. It's expensive but for an hour me and my daughter(normally wife comes) just floated in the water.
If you haven't tried it can't recommend it enough. Sadly like things back in bed today but just for that 50 minutes I had total weightless on my joints in the hot water. Bliss!