It's time to get angry. Remember all that taunting you got at school for being podgy? Let it all out and go hell for leather. Bonus points awarded for primal screaming at full volume.
4. Steve Vai - Bad Horsie
Back to the slow, more methodical efforts here. Take your time, move in time with the music. Enjoy the sound of a guitar impersonating a horse. Seriously.
3. Opeth - Master's Apprentices
It might be the last song of your workout, but it's a beast. If you can last the full 10 minutes of this song then you're fitter than you ever though. Take your time, enjoy the music and get angry when you need to. Take the quieter moments as brief rests before it gets heavy you get back to the task at hand.