Senses Fail's Renacer the last year alot at the gym. ADTR's Common Courtesy too. Nightmare from A7X is a good gym record. Rarely listen to it outside the gym though lol. I listen to blink's self-titled at the gym alot. Mindless Self Indulgence's new album is one I like to do treadmill to oddly enough lol.
Renancer is awesome for the gym.