I did a 5 week Insanity/Asylum/X2 hybrid in prep for my back to back live workout weekend w/ Shaun T. It was a great hybrid and I enjoyed it. It was tough and I noticed my resting heart rate creeping up. I was also under a lot of stress which contributed. My resting heart rate was back up into low 60s after being in low 50s which can be a sign of over-training/stress. After Tai Cheng in the evenings, it would even be 49bpm. Well, I'm on week 2 of the BUR, and last night took my resting heart rate. It was 45bpm!!!!!! Look at what a week of rest does for a body! YES!!!!