Workout Update: 645 Cardio/MBF Day 2

On Day 2, I did the 645 cardio routine in the morning and the core circuit workout in the evening. The core circuit workout was challenging, although easier than the first time I did it.  I was able to do 5 rounds of the AMRAP circuit at the end of the workout, which was better than Day 2 the first time I did MBF.