While Trying To Get Across The Street Quickly, I Did

While trying to get across the street quickly, I did a short sprint in the crosswalk but midway through it felt like my lower right calf muscle snapped. It was a dull soreness later in the day. A few days later I did a quick jog to pass a dog on a walking path and the same calf felt like a balloon popped in my calf. This time it felt like searing pain and movement hurts. What did I do to myself?