“Hairgrish” of the day

From the US edition Cosmopolitan for February 2011:

Body boosting tip

Volumizers require heat for activation- otherwise, they just sit on your strands and do nothing. Blast freshly sprayed roots with your blow-dryer to lock in lift.

Okay, so this isn’t one of the worst "Hairgrish" ever, but “Sit on your strands and do nothing”? Really? Does the blow-dryer heat make the product do a little dance maybe? Or make the products levitate over the hair to create volume that way? Does the heat dramatically change the chemical composition of the product?
All products “Sits on your strands” and blow drying in itself creates volume.