In case anyone is interested, I'm posting my results. I strung all the Hiits together today: 40/20 warmup + cardio, Double Wave Cardio, 30/30 Cardio, Circuit Blast Cardio + CB Stretch. According to my Polar F4, I came in at 1:23:25 (including extra time for switching disks--and tightening my shoe laces after the warmup). My average heartrate was 146, maximum HR 181 (not sure when that brief spike happened--probably the butt kicks), and calories burned = 600. I'm 42 years old, 5'2", and 122 lbs.