With the Olympics less than two days away, now feels like a great time to talk exercise clothes. So: How are yours? Still sweating it out in T-shirts from your high-school lacrosse team that are so worn out the designs have come off? We know it’s not just us! But being sweaty and stylish is possible. And decking out in Stella McCartney’s Adidas duds are one way to do it. Her fall 2008 collection hits stores this month, offering apparel for dancing, running, tennis, golf, and winter sports. If nothing else, stuff like this ought to motivate you to get your holiday-cookie-softened rump out of the house and into the gym this winter. Because when the thermostat dips below 45, who doesn’t need all the motivation she can get?