On my last two runs, I have managed to keep up a 7min/km pace without really troubling my cardio ability. However, I feel I am being held back by heavy/tired legs and ankles. I used to play football and know what it feels like to strain muscles and its not that. They just feel like lead and even at times numb. On my previous run, I constantly felt like I needed to 'crack' my ankles (which I did at the end and it was quite loud!). Any tips on how to overcome this? I really feel I could run 5k in 30 mins if I can get round this!
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