Can't Run Due to Bad Knees?

If you have bad knees, hips, or leg issues that prevent you from running (walk/run) and would like to participate in the 1/2 Marathon/Running Mini Challenge, you can ride a bike in lieu of walk/running the miles so as not to do additional damage to your joints.  You will assess the points in the same manner as those of us who are walk/running.  No excuses for not getting out there & trying!!!!