Metallica, Godsmack, Rage, Slipknot, Nothingface, Fear Factory, Static X, Mudvayne, AC/DC (Back in Black), Iron Maiden, Motley Crue, testament, Slayer, rancid, Green day, etc. Sometimes a little techno aint bad either.
Anybody who doesn't use a walkman at the gym is surely missing out. It...