Depending on how lardy you are your piriformis makes up either a small part of your arse or a very small part of your arse. Trouble occurs because your sciatic nerve gets cosy with your priformis, so swelling and inflammation of the latter irritates the former. Sciatic nerve pain is a little like toothache of the bottom and no amount of brushing is going to sort it out.
It's not hugely painful and it's not hugely debilitating, but it's concerning in that it may represent my first overuse injury. It seems to be easing of its own accord though and hasn't impacted my running too much.
In truth, the whole situation probably doesn't even warrant a blog post. I just wanted to use my piriformance joke and talk about arses.

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