Musical Exercise?

Over the weekend, I read another National Geographic article, only this particular one was about the effect that music has on you while you're working out. Interestingly enough, research that has been done reveals that listening to any type of rhythmic tune will lessen your body's perception of exhaustion and increase the physical output from your body. Of course after a prolonged workout period, your muscles will feel spent, but listening to music and moving with the beat increases your endurance. I found this interesting because when I run around my neighborhood, I will occasionally listen to my iPod, and I actually run less than I usually would in the same amount of time when not listening to music. I do know that in the research, about 1/6 of the volunteers didn't experience this phenomena. Maybe I'm just in that 1/6..... I half wish that it actually did boost my performance. I'm curious about why the boost even occurs. I'm guessing that it may be psychological, but I will definitely look into that and post what I find!