Sarah~ one of the trainers at my gym showed me a move to strengthen the muscle behind the shin bone. She told me the soreness is sometimes do to the imbalance in strength b/w your calf muscles and the muscles behind the shin bone. If you belong to a gym, you can use a heavy weight, like a 25lb round weight or if you don't belong to a gym, you can use something heavy or even a couch. What you do is sit in a chair or bench place the weight on your toes, with your legs at a 90degree angle bent at the knees. Then just using the front part of your foot and your toes, lift the weight for 15-20 reps on each foot, 3-4 times on each foot. If you use a couch, you can do the same thing, sitting on the edge of a coffee table or even standing. Hope your legs get better for SD!