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					Originally Posted by  kaisersozei
					 
				 
				Another tip:  pace yourself during the workout.  I used to start out going balls to the wall, and by the time the third interval came around, I'd be spent.  Including the warm-up.  I was trying to keep up with the people in the video until I realized they were all about 20 years younger.   
So during the interval days, I typically start out slow/moderate for set 1, go a bit faster in set 2 but still able to breathe (say, 70% effort), then go all out in the final set.  This is easier to measure with a HR monitor, you can track how you're doing in the middle of each set--I'll typically hit something like 125, 140, 160.  
			
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 I'm trying to do this as well but haven't done a great job yet.  On the third set of plyo cardio circuit today I was trying to push through but just couldn't.  Those 4 pushups, run it in, jump up and back down is tiring.  Then the exercises after that, I'm beat.