There are many alternative options to choose other than running. Swimming is a wonderful workout option for those with bad joints, certain health problems or the elderly. Also, dance can help you in your Circadiyin efforts.
I also recommend that you choose a "weigh day" that doesn't contain a cheat meal, as this can often add a pound or two of water that will come out by the end of the following day (my experience, at least). Circadiyin can help you to get fit.