Aborted Speedwork

In an attempt to bring a bit more structure to my "training", I've earmarked Friday mornings as a speedwork session (reps, TT, etc). So this morning, I trotted down to the local footy field, set the lap counter and jogged around the gravel drive to check distance (478m) and set a benchmark time (2:27; 5:08 pace). Nicely warmed up, I set the lap counter again and ran off. Stepped across a rabbit(?) hole and wrenched THE ANKLE. FUCK! Hobbled to the edge and sat down to contemplate what I'd just done to myself (not good), holding the ankle tight to prevent any swelling (not good). The pain stopped after a few minutes (good) and I walked home slowly with relatively little pain (good), just feeling a little delicate on my pins. Plunged it into a bucket of cold water, and dug out the compression stocking. Grrrrr.... not happy. 2.9 km in total.