Workout Update: Lift 4/Shaun 20/645 Cardio hybrid: Day 2

On Day 2, I did the cardio circuit workout from Shaun 20 in the morning and then the Lift 4 back and biceps (circuit) workout in the evening. The Shoun 20 workout is similar to the cardio circuit from Insanity in that it has three rounds of four exercises, with a strength exercise that transitions you from block to block. Of course, the exercises are all low-impact, but the workout is still challenging. The Lift 4 workout was a challenge as well. I was really trying to focus on my lifting speed and form, trying not to do the reps as fast as I normally do.