Workout Update: 645 Cardio/Lift 4 Hybrid: Day 42

Day 42 is the start of week 7 in Lift-4 in which the exercise combinations are changed. I did the 645 cardio routine in the morning and Lift 4's chest and back workout in the evening. Chest and back this week is a circuit workout. You do three regular blocks doing the same chest and back moves as in the prior weeks, and then you do a three-set burnout block with regular push-ups, back extensions, and wide push-ups. It is a rough workout that kills you by the time you are done with the burnout.