I've been running for longer than i care to remember. But for the last 6 weeks i've struggle to run even 3 times. Each time i run i manage to pull the narrow muscle that runs in- between the calf muscle. I've allowed myself 10 days rest after the last pull. I went out last night and was lucky if i made it 500 metres before it started to tighten up again. I stopped running before it went completely. Can anyone help me here as i'm becoming really fed up.