Thanks for all the info.
It's not that I'm learning anything new; I'm getting back into shape for doing what I was doing last winter, but didn't do from early March 2011 until Jan 8th of this year. In fact, on my first day I felt I had all my skills back, making a lot of controlled turns in all kinds of terrain.
Then I had to stop at 3:00 PM, because of muscle fatigue and the beginning of some small cramps.
You know how you feel a cramp begin in a muscle, but if you move the right way, you can prevent it? Like putting out a spark before it ignites a fire.
Needless to say, stopping and doing strange things with my legs, bending over, straightening, shaking one at a time, etc was NOT what I wanted to spend my time doing on the edge of Hellgate, so I gave up that first day at 3:00 PM.
That diagram shows exactly which muscle it is. I feel most of the pain at the origin and insertion of the muscle, not in the central mass of it.
Quite often the cramp starts when I lift and twist my lower leg, to change my socks or tie a shoe lace. Or when I sit up in bed and swing my legs off the bed to stand up.
I sometimes have to step into my shoes, then bend over at the hip, like a hamstring stretch, to tie them, to avoid provoking that muscle after skiing.
I take calcium magnesium and zinc, in a tablet with vitamin D3, from the same maker as the SAMe that I take, on the advice of my orthopedist.
I also take potassium gluconate.
Separately I take vitamin B Complex, because the SAMe needs the B vitamins to work properly.