Have a few days of RICE, then stop being a wimp if possible.
In December I fell and broke wrist in 4 places, arm put in fibreglass cast, took pain killers, went to gym and did walk/run for 20-30 mins, also cycled in gym but couldnot put hand on bars. The doc had agreed this was a sane plan as I have a duathlon in April and sprint tri in May.
Warning, make sure you hold hand away from body enough so you donot catch it against clothing or body as arms swings - it will hurt- I know from experience.
I am now outside running as normal but still having physio on wrist, all is not lost.
Edited: 10/02/2011 at 22:02