To get myself fit faster I took up running this spring. Going from fairly out of shape I got myself up to about 2 1/2 miles of what I'll call jog/run. Definately getting good arobic benefit from the the program as I've gradually increased the distance and the intensity of the workout. Here's the problem. I've developed a pain in my lower left leg above the anke. Near as I can tell it's a shin splint. Hurts when I run. So now I've stopped running and it's on to the bike for the morning workout. Question: How long do I have to bike at a moderate pace to equal two miles of jog/run combo?