It’s the start of a beautiful day. You were able to get to the track around 6:00 am for a solid speed workout, your favorite. You warm-up, go through your stretching and dynamic movement routine, and besides a little early morning stiffness, you feel great. Then it happens, you are on number 5 or 12 200 meter repeats, and the back of your leg cramps up something fierce! You stop, stretch, massage, but nothing helps…now you can’t run - workout over.