After my workout i started to run on the treadmill with a 6.0 setting. i do my normal stretches, walk for 5 min, then run. About 5 min into running i can feel my calves tighten up, and it starts to burn, 10 min into running i have to stop. When i get of the treadmill i can hardly walk as my calves are so swollen and tight, all i want to do is sit down and rub them, heh. Whats the problem here? I have nice adidas running shoes, so that shouldnt be the problem?