Hey all, I have recently started hitting cardio every morning on an empty stomach. I need to drop my BF% in a big way. I am doing a form of interval training on the treadmill mixing up brisk walking, running, sprinting, and varying degrees of incline. The problem is, after the first 10 minutes or so, I get the most RIDICULOUS pump in my calves to the point where I basically can't feel my feet. I've tried stretching before the run, after the run and some other stuff but nothing is working. Any ideas? I may need to switch the method of cardio, but it doesn't make sense to me that i can't run without my calves blowing up on me like this. Any help is greatly appreciated!