Here are a few from me...
Killswitch Engage, the 'As Daylight Dies' album in specific. Good for running, lifting, and a solo bag session.
Three 6 Mafia, "I Got" and "Knock the black of yo a$$"
Comeback Kid "Wake the dead album"
One thing I am surprised no one added, or maybe they did and I missed it...Prodigy
They are definitely a group up there with Powerman5k that gets me motivated.
"It is human nature to find an easy way of doing things. Nothing can take the place of hard work." -Dan Gable
Iowa Wrestling Coach