When would you consider it a sensible time to resume running after a "popped" calf muscle? I pulled it last week and left it 2 days and it was fine yesterday, until 2miles in and it went pop. First time I've experienced that so unsure when to start again. I've been running since November and this is my first injury. Would you say the cold had an effect on this happening? I do run in shorts, even sub-zero. I'm not entirely new to running, I used to run about 6 years ago but gave up ! Maybe, or maybe not OT but what influence would having the wrong shoes have on this problem?