I also never bother with heart rate monitoring and such, and go by perceived exertion (and even then, I only *really* use that for running - if I know I'm going out for a long run, for example, I'll make sure that I'm feeling quite differently than if I'm out for a tempo run... With videos, the nature of the video sets the pace for you - I don't have to change anything.).
A number of years back I participated in an experiment to determine max heart rate, and mine was MUCH MUCH higher than what would be predicted by any of the formulas out there. So for me, using HR as a guide for anything at all, is absurd.
I honestly don't really get the point of it. Do people really scale back their effort because they notice a little number on some monitor, that is higher than they think it should be, regardless of how they feel? Or they need the HR number to increase their intensity? They wouldn't notice that they aren't working hard enough without the number?
Apparently I'm a simple gal. I work out hard. If I am feeling like I'm really overdoing it and won't get through the workout, I scale back a tad. It's a pretty easy system.
