Been having an issue with my biceps lately, whenever they've been flexed for more than a few minutes (e.g. reading a book), its hard to straighten my arm afterward. If I do, the muscle feels extremely tight near the elbow, and is quite painful. This goes away after slowly stretching it out and massaging it a little.
My training consists mostly of the Olympic lifts, pulls and squats, and twice a week I bench, row, curl, OHP. I guess it has something to do with the curling and rowing. I stretch my biceps as part of the general warm up but thats it.