I’ve done that routine. It was on a Cybex Upper Body Ergrometer (UBE) I forget the settings but you have to set it to something like 90-120 RPM and “bury the needle” a few times. It was so tough that I had to lay down for 20 min after. I felt as if I had just ran a 400m. I’ve been thinking to use this when the weather is bad for the Special endurance days. It’s different work but it made me feel like crap just the same.