I have a goal to build slowly to 10k. This morning I managed to run4 miles my longest distance yet. It included some hills and I felt OK towards the end. I even managed to sprint a little faster to my finishing point hearing Laura's voice in my ear saying 'finish strongly- you can do it' ! Really proud of myself for not feeling absolutely knackered. Is it enough to do this once a week and try to build up in a few weeks time? I've heard something about 10% is that per week or per month?