....whilst out injured to try and maintain some semblance of fitness?

Throughout this year, ive been training once a week, a hard interval session with my club, real quality session. Then ive been resting up till racing on the weekend. So im probably running 15-20 mile a week. I cant manage anymore than this as I have a shin injury that prevents me from doing anymore than that.
Would doing leg weights be benefical to me whilst im not running much? or what else should i be considering doing? apart from complete rest

Ta very much like