I got... the jimmy legs.
Not incredibly often; but after some mega-intense efforts, generally 5 or 20 minute intervals, I'll stop... but my legs won't. They'll start shaking, almost uncontrollably. Think shivering, and multiply the amplitude by about five-ten. If I concentrate I can make it stop, but usually I'm too tired to care.
Am I defective? After you answer that, do you have any comments on the jimmy legs?