Broken bone keeping me off treadmill, I need suggestions.

I have been devoted to MFP and logging everyday since January 1 this year, going on 100 days today! In early February I unknowingly broke my foot but I did not miss that treadmill, I was on it everyday. Well the pain got a bit much and I finally went to my Dr. for the dreaded news of a broken bone, I was crushed. I had done so well, I was so commited and now this, I cried. I have been working with weights to tone upper body and that has been effective but I need tummy and lower body exercises I can do until this foot heals up. I know it's been a while and the walking boot is off but I followed up a broken foot with a knee injury that followed with a "baker's cyst", yeah, sucks for me. I wil bounce back but don't want to get too far behind I know me I will loose motivation if I loose momentum. Any suggestions?