Hi I'm a newbie, unfit and never been a runner. Running on a treadmill I have completed week 1 and first run of week. Today after a days rest I did run 2. After the second run my calves felt like lead weights. I did complete the run. My question is, is this something to be concerned about? Do I just keep going the day after tomorrow and do run 3 or should I rest extra days. Any tips advice much appreciated. Thanks. Adrian.