without knowing age and or other other factors one would assume is an overuse issue. Could you elaborate on age, possible previous injury, conditions like swelling, and if the pain ever goes away completely?

* im not going to say for certain, infact... diagnosis, is way past scope of knowledge, but based on what you are explaining and what i have seen in the fitness field i would look within the hip. (especially if the pain is long lasting and never seems to go away completely)

lets hope its just its muscle fatigue related and eventually it will go away on its own.(perhaps try ice and or heat minimize swelling/enhance circulation for healing sake). but... it should be a consideration that your hip flexion/external/internal rotation action is causing some sort of premature hip wear. especially if we are aging and have been replicating that action for a long time before your new found hobby. (think about any sports, sitting posture, leisure hobbys ect.

you will prolly get a good idea on whats going on as more people suggest thngs to test for, but let me be the first to tell you if it doesn't go away and the PAIN continue to get worse "go see ur doctor"

nick k