I hadn't considered that the Shure's might be noisy; thanks for that note Marco.
From the input from those who do use them during athletic endeavors, sounds like this may not be as much of an issue as it is just sitting still in silence. I use mine to listen at night when my wife is reading so it is mostly silent and I am concentrating on the music. Yes, that does definitely make the sound of my own movements more pronounced. Perhaps the effort of running would make that a moot point as your concentration is elsewhere. I play racquetball and I haven't bothered trying out the Shures in the racquetball court. Don't hold your breath for my review on that application either. Oh, and I'd completely agree that the earbuds Apple ships iPods with are best utilized to tie off your trash bag before disposal. The Shures, at least the e4c's, are a world apart.
Marco