Well, after staying up late to plan our school week and getting up at 5:30 with fussy babies, this workout was a dud when I did it at 5pm. I completed 50 / 60 minute routine and skipped the Abs tape. I've had this weird thing in my back bugging me too and it was flaring up. When I started feeling like my legs were gonna give out, I knew it was time to quit. Had to rest in Child's Pose for a bit before climbing the stairs.
Got my heart rate monitor back from the repair shop - so I'll post my results.
Calories burned - 410
Average HR - 137
Max HR - 180