Knowing how to judge your exercise intensity can help you meet your fitness and weight-loss goals.
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.mayoclinic.org%2Fhealthy-lifestyle%2Ffitness%2Fin-depth%2Fexercise-intensity%2Fart-20046887&key=ddaed8f51db7bb1330a6f6de768a69b8