Ah yes -spin training. I hate it. Thankfully I've always done it OK. At 10,000' it's not that scary as the ground is a long way away... But they don't let me do it that high anymore, plus it's not often we can get that high. We use a DG505 which has a vast canopy in the front giving one a vast view of the world going round.
Gingernut:
I'm fine in the air but watching roundabouts gives me sicky feelings - so does watching aerobatics, even though I used to do trampolining... The only times I've had genuine motion sickness (though never quite to the point of actually thowing up) has been when I've been very, very tired. One time I'd been up all night for an alleged ascent of Hellvelyn to watch the sun rise on midsummers day (the coach broke down so it was a night ramble near Ingleton), the other time after some XC ski-ing near Aviemore and I was sitting on a length-ways bench in the back of a landrover which I think was part of the problem. I was cold as well that time.