Walking Progress Seems Absent, Even Reversing

 This morning, amidst the high humidity and stifling heat, I got up and steadfastly took a painful walk/run around my .7-mile home block,doing very brief, slow jogging on the road back.  It was difficult and punishing, doing this. I don't feel that I am making the degree of progress that I had wanted:maybe there's no improvement happeningat all!  In fact, I feel like I am sliding.  Simple motions are getting harder for me. I prefer to avoid outings that demand physical endurance, balance, and the strength required for me to adequately lift my feet and legs from the ground while maintaining a sense of functional balance.  It's very discouraging when I just want to turn up the air conditioning and go back to bed and hide beneath the sheets...