I don't think it's fair (and that it is asking for trouble in the longer term) for a new partner to expect you to give up something you were doing before you met.
However, compromise can be the way forward...
Maybe do races a bit less often, and sometimes in locations which have something of interest for her?
When it comes to training, could she accompany you on a bike, maybe?
(Point out that if you stop running, your sex-god physique may not be maintained to the same level?)
If all else fails, ditch her and date a runner. It worked for me 
Edited: 30/08/2012 at 15:10