That old familiar feel 

In my case it was the “burn” in the leg muscles, mostly going uphill, like against gravity. I was coming back from lubricating the water turbine electric plant, too. It was maybe a 200 foot climb.

I figure it will help me in my pursuit of quality of life, age be damned.  Said another way, we all know we are going to die, but dignity is a goal worth pursuing. 

And the old familiar burn in the leg muscles made me feel good about myself.