I'm in the army and usually get about 8 - 10 miles a day, 4 - 5 in the morning and the same alter that night. Shoes DO matter. Normal shoes are made for every day walking and are supportive for just that. Running shoes will usually have a slight curve to them, and some even have a thin lining inside of a few coats of the rubber to keep the curve, this helps with overall form and keeps your foot and leg in a good motion. It is like having round wheels on a train compared to square blocks. Definitely if you are serious about jogging, get the proper footwear. I would also suggest gel inserts, but make sure they fit SNUGLY inside the shoe or they will flop about and eventually cause more damage than they prevent.