Before or After

There have been many arguments about whether we should do cardio exercise before or after weight training. The other day my friend told me I could lose muscle mass if I do cardio after weight training. It made me wonder, so I Googled it (thanks god for this !) and found many articles which recommend to do cardio "after" weight training. "The study clearly shows that doing a weight workout before aerobics leads to hormonal changes that increased fat oxidation (read weight loss or fat burning) during the following aerobic workout." Also, if you are at the stage of bulking up do the cardio after the workout. If you want to tone down, you can do your cardiovascular exercise as a warm up before you lift weight. More article here.