I need some help! I have tried everything - going slower, going faster, thinking about something else, increasing warm up to 10 mins, running for 10 mins before start to try and fool my body but NOTHING works . As soon as I start my legs feel really heavy, breathing really hard and it's just all horrible . Luckily I now know it only lasts for wee while and once I get to 1k marker it's much better - not easy but better. I always know I will manage to complete run but if anyone out there has any suggestions to help me at start I would be so grateful.