I get a numb calf when I take a walk on a treadmill. Normal walking is ok, but that treadmill always gets me! I think it's because normal walking doesn't have the resistance the treadmill gives you. Anyways.... I talked to a doctor about it and he said that any kind of exercise really does a number on your muscles and you just need to spend more time stretching it out before and after working out. I used to get swollen ankles after working out also, but since spending more time stretching out, this doesn't happen as often. Try that and see if it helps.
