I keep reading about calf muscles cramping. I've never experienced this. Over the last 2 rides, it's been my thighs cramping just above the knee. And why are both thighs affected at the same time, I find this strange. It must have something to do with electrical stimulation of the muscles.

Am I doing something wrong or have the bike setup incorrectly? Does having the seat to low create problems if the legs are not extended properly through the pedal stroke?