I have nothing to "focus" on while "training" (in quotes because I don't race). I don't need to hear the numbers on the computer. What am I going to listen to -- sweat? Heavy breathing? That's fine while having sex, but this is a bike. I start to get bored out there, so I sometimes bring my iPod.

The funny thing is, I usually listen to podcasts because music that's a different tempo from my cadence starts to throw me off.