While the fitness industry has seen more than its fair share of trends, exercise fundamentals have pretty much stayed the same: To get your best body, challenge your muscles with heavier weights and new exercises. To burn fat and calories, increase your workout intensity. And to stave off boredom, mix up your routine. That's not to say the basics can't stand a little updating every now and again. To make sure you're getting your best workout, we tracked down the current thinking on everything from maximizing fat burn to stretching. Try one of these new approaches every day this week and we bet you'll feel stronger, firmer, and more energized. After all, the only thing you have to lose is flab.