I did some hardcore Westside stuff, but the worst workouts I ever did actually involved cardiovascualr effort.
I used to do this interval deal with the black medicine ball, I think it was 10lbs. I would hold the ball over my head, and sprint up and down the stairs one at a time for 3 attempts. I would then break until my HR was at 120, then, I would sprint up with the med ball over my head skipping every other step on the way up and hitting every step on the way down for 4 sets. I would break until my heart rate got to 120 and then I would skip 2 steps at a time on the way up and hit every step on the way down for 5 sets. I think the flight of stairs was 10 steps up. I would go 1 step, 2 step, 3 step, 3 step, 2 step, 1 step, 1 step, 2 step, 3 step, 3 step, 2 step, 1 step. It would take me a half an hour and by around the 3rd set of 2 steps my HR wouldn't go below 130 so I had to go then. By the end I couldn't even pick the medicine ball up off of the ground and walking was a chore.