question: Hello, I m 69 years old 5-11 215 lb I can walk 2.4 miles in 45 min , non smoker for last 15 years I am on BP Med and it is controlled 130 over 78.but i am by no means Chiseled Recently when I stand and walk after setting I get a tingle in back of my legs Mostly in my left one and my feet, Walking for a couple of minutes and it goes away never had this before