You’ll want to be ready if you find yourself on the receiving end of a Kate Hall medicine ball toss. I wasn’t. During a midday early May workout, Hall recruited me to catch her throws and roll the ball back to her. I moved to the middle of the infield at Fitzpatrick Stadium in Portland, Maine. From just inside the track, Hall sprang forward and heaved the 8-pound ball. Next thing I knew, the ball landed just in front of me, bounced, and crashed into my chest. It left a red mark on my sternum that lingered for a week....