Getting back running after a break can be a challenge. After 18 months away from running I’m finding it hard to get back to my previous fitness level. But I have made a start. And there has been some progress. Here’s an update on what I’ve been doing and some tips that might help you. In December of last year, I was in the worst shape of my life. I was juggling a full-time job, 300-mile weekly commute, master’s degree…