How do they do that?

It's no secret that I'm a huge fan of Olympics Ice Dancing and figure skating and I love watching the competitors but I am left with some questions.  First, how do they do spins (twizzles) first in one direction, then reverse, and not get dizzy?  Second, when the figure skaters are doing their elaborate spins, with their bodies contorted into amazing shapes, how do they keep getting faster and faster?  When you spin a top it slows down.  Why don't they?