Well I was able to get in a workout right after work today.. I did 60 minutes on the Arc trainer for 970 calories which would be a Quarter Pounder with cheese at 430 calories and large fries at 540 calories. My heart rate average was 151 with a max of 174. My legs were buzzing when I got home. I wolfed down a salad when I got home because we had an errand to run..