i am 41 years old very active 6 ' 4" 230lb male i workout about 5 days a week,,in the last 3 weeks i have had some tingling in my feet mostly in my left,,, i may have hurt my back doing yoga but i have no pain ,,the only back problem i have is about once about every six months i will get a catch in my back that will hurt down my left leg,, my low back seems kinda stiff and achy but i have no other problems,,also while standing i have little or no problems,,,i work about 50 hours a week in a chair at my job,,when i sit in my chair is when the tingling is the worst,,,any advice????