Hi. So title says it all. As soon as I set off today I felt niggle in right hand bum cheek/thigh. Wasn't sure whether I was meant to carry on regardless our not, but I did. Felt it all the way round run. Now 4 hrs later, still there. So is this normal? Do I ignore it? Do I do a particular exercise? Could I have done something to prevent it? Never had probs before, and didn't feel it til I started run. Cheers.