This is probably something really obvious but...
Since I've been running 5k (as opposed to 30 mins), I've noticed a "tight" feeling where my leg joins my behind, on the right hand side - sort of an ache - it stops me taking too big strides, but I am able to run through it.
I don't do any stretches - so could it be this??
I'm also wondering if I should get a gait analysis and new trainers, as I bought these ones off the shelf at an outlet shop.
Sound familiar to anyone?