Yes, there are ways other than the hard ones (exercise, balanced diet, etc.), but they are all either illegal or unadvised. The illegal which come to mind are the amphetamines, including ephedrine. The unethical (except if a medical condition exists which indicates its use) include thyroid replacement medications (no, I'm not going to tell you the name brands). Of course, if your metabolism is truly low, you should see your Dr., and get him to draw at least a T3 and T4 panel to see if you are low thyroid. Maybe you'll get "lucky" and have Grave's disease. Or Cushing's. There are others, too, but not being an endocronoligist, I'm not going there.
Suffice it to say, the hard ones, although hard, are much safer than the easy, quick fix ones. Sorry.