I found this article on NRDC that I thought might be of interest here. Walking is not something we do as we should. It is easier on the environment and keeps us moving at the same time. You can all read it here.
http://www.nrdc.org/thisgreenlife/1204.asp

     

Due to my illness of Rheumatic Arthritis walking is the only source of staying fit for me. Used to do some exercises with dumbbells once upon a time. But not any more.