We all have fitness and training goals. And we use a variety of techniques to reach them. The truth is, a lot of them are pretty straightforward and a lot of them are over-hyped.
The downside to the variety of training techniques is that not a lot of folks really know exactly how they work and what's best for us, the individuals who use them. I wrote an article on the use of circuits that may shed a little light on combining strength and cardio and when its good and when its not.