I am a 50-year-old man who enjoys running. I have completed several half-marathons and began training for longer distances. A few months ago, I tore my calf muscle. I went to physical therapy, and all seemed to heal well. However, last weekend while running, I felt a strain in my calf. Is there anything I can do, or will I have to give up running? I was really looking forward to completing a marathon this coming spring.