Love me some heavy metal when im in the gym. If I had to pick a few specific songs right now they would be "Back for More " By Five Finerg Death Punch
http://www.youtube.com/watch?v=N2icdM9KuHU , " My Last Serenade" By Killswitch Engage
http://www.youtube.com/watch?v=OoQrwKJtv_c or perhaps " Nothing Left " by As I Lay Dying
http://www.youtube.com/watch?v=Fh-RgX_2U9w .To name a few in my Ipod