I can't do shuffle since my ipod is all over the place. I normally create a few playlists every couple of weeks.
Lifting: a life once lost, the explosion, kid dynamite, converge, mastodon, torche, floor, dillenger escape plan, dropkick murphys, small brown bike. dimmu borgir
Cardio: same as lifting but also include more electro or neo-house stuff like digitalism, lcd soundsystem, cut copy, simian mobile disco, justice