of Connecticut, researchers found that lifters who rested for one minute or less between sets experienced nearly double the metabolism boost of lifters who rested for three minutes.Rule Four: Crunches will strengthen your core.The Whole Truth: Crunches don't work

metabolism.The Truth: Caffeine improves carbohydrate burningA review of ongoing research has shown that caffeinated drinks don't make you wee that much more than equal amounts of beverages without the buzz. Also, studies have shown that caffeine lowers your

and for your body to clear out any metabolic  waste created during your efforts," says Kastor.7. Don't worry if you ache a littleIf you ease into running, your post-run discomfort shouldn't be debilitating. If it is, return to walking and running. However, don

to let your heart rate return to normal and for your body to clear out any metabolic  waste created during your efforts," says Kastor.7. Don't worry if you ache a littleIf you ease into running, your post-run discomfort shouldn't be debilitating