Or rather, how fragile? I know jogging and other turbulent activities can damage the HD of a Classic but I also know that many do it anyways without incident. I think personally I would or will (should I purchase one soon!) err on the side of caution, at least compared to some...will probably get a Shuffle for jogging...but I still would like to feel comfortable carrying my classic around while walking (I live in a downtown and walk for most my needs, so I guess this will include stairs which would mean some jerking motion), cycling with it in my pocket (I cycle long distances), possibly hiking. Would those activities still risk damage to my Classic? Would a conservative approach basically mean just sitting around listening to it at home or the office (something that my laptop/stereo can handle for me)? I know this topic has probably been discussed to death but the Classics haven't been around that long and I welcome any input as I'm really about to make a purchase imminently. Thanks.