Excerpted from "A Year of Health Hints"
365 Practical Ways to Feel Better and Live Longer
No, this isn't a suggestion that you audition to guest host "The Tonight Show". It's just a simple way for you to tell if you're
overdoing it when you exercise. If you're too out of breath to comfortably carry on a conversation with another person as you
dance, run, or slam-dunk your way to fitness, you're probably working too hard and should slow down. (On the other hand,
you should be working hard enough to break a mild sweat.) And of course, any unusual sign of physical distress (such as
chest discomfort, pain of any kind, or dizziness) is a signal to slow down to a stop.