If you are running with them I would advise against IEMs or 'phones that are *too* isolating.
One reason is that you need to hear what is around you a little bit - particularly if you run near roads or on paths that are shared by bikes or rollerbladers.
Second reason is that IEMs tend to amplify your own internal sounds. Not a big issue if you are sitting quietly but you may find you quickly tire of the sound of your own breathing (and even footsteps too) if you are running hard.
I agree. In fact, I just wouldn't listen to music while running or biking at all. Walking? Safer. Where the IEMs are really useful is on cardio machines and in noisy gyms. They knock out enough ambient noise to allow you to listen at much lower, healthier levels.
Tim
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