start drinking gallons of water on a daily base, there is this herb extract called "Golden Seal" it's a natural herb that you can get at most health food stores. Its all natural and it helps the natural cleansing of the body. One of my homies dad told me about it when i was in a similar situation with drug testing. I believe you put 3-5 drops in a single glass of water, however i used gallon jugs so i would put atleast 30 drops in it to make sure i got the full dose. The taste is disgusting, but it works. I got clean in a week after id been smoking for months on a daily base. Exercise will definitely help speed it up, also sitting in a sauna for 20 minutes a day will just cleanse your body out. Depending on what kind of drug test it is, if its sent to a lab and they see the golden seal all you have to tell them is your a health nut and you like to keep your body clean of extremities. Dont use those drinks they selll in head shops, they never work and they come up on every lab test. GL