I find that I have to pause several times during a workout sometimes and take a 1 or 2 min break. I am now doing MIS and I find it quite brutal. I take a break inbetween the chest superset if I want to complete the 2nd set of pushups. I take a break between the the barbell upright row and the barbell shoulder press and also between the barbell bicep superset. And on top of that, I don't even do the workout as a full w/o... I actually spread it over 3 days as after doing the legs (which I find tough) I am so winded !!