My girlfriend is a Spin instructor, you can't pinch an ounce of fat anywhere on her lower body. I took the class once and I damn near threw up. I thought it sounded easy, but it really does mimic cycling and all of the climbing done on a bike.
As far as Poliquin, he should look at the Tour de France field if he feels cycling creates fat thighs, I could fit my hand around the entire field's thighs. The reason he sees so many overweight women in spinning classes is because they go once or twice a week or whatever, they use a very low intensity, then they continue to eat in a very poor manner. If you eat like shit, it doesn't matter how you train, you will be fat, I am sure Poliquin knows that, but he had to spout off anyway. Possibly the diet of the girl he trained changed and thats why her BF dropped, besides, 9% bf on a woman can't be too good, and why it is attainable, I can't see how a girl could hold that for more than a day, but that is Poliquin, just like all his clients run a 3.2 forty and bench 900lbs at 0.1% bodyfat because of the use of such miracles of training as the swiss ball.
Regardless, I train to gain strength, and the LAST thing I want is small legs, but I just had to say something because I know for a fatct that cycling (spinning mimics cycling) does not cause fat to be stored. That is ridiculous. Look at the average trainee in the gym, they look like shit, they don't work out hard and they eat like shit. If you spin intensely and eat right, you will NOT become fat. My rant is over, that just got be fired up because I think Poliquin, is an an intelligent guy, and he used an example of he average woman to bash a form of exercise that is very beneficial if done with proper intensity and a proper diet is followed. I mean, if you live on bagels and rice cake you'll be fat no matter how you train. Maybe the ladies he sees spin half assed then go to Krispy Kreme, I know what I have seen, and that is people dropping enormous amounts of bodyfat and building firm muscle in their legs through spinning. I by no means have the desire to train like that, but it does NOT build fat.
Tell Lance Armstrong and Jan Ulrich that they only "think" they are working hard, but they are truly bulding fat, and swatting a fly swatter 100 times in 30 seconds is equivalent to what they are doing.