Trying to Get More Exercise is Hard to Do

I found a park with a really nice river to go walking the trail by today. I walked for about 20 minutes 1 way, and then headed back for 20 minutes the other way getting in about 40 minutes for a walk. I realize that my little tire on the front of me is causing my back some pain and I need to tame it or it will cause me no end of trouble in the future. It's and extra weight that shouldn't be there, and I now get the meaning of the term 'spare tire.'