Was so chuffed with myself for completing C25k and then running every night. Comfortable with 5-6k and not not getting out of breath. And most of all- enjoying it! But...I've ended up really hurting my leg. Sort of starts at the groin and goes down my thigh. So annoyed. As soon as I run the leg completely cramps. I'm wondering if better trainers might help and just gently rebuilding. Any advice on trainers? Don't want to spend a million pounds but think this might help to literally get me back on track!