Talk Test
The final method for measuring exercise intensity is the Talk Test. Like the RPE, the talk test is subjective and should be used in conjunction with taking a pulse. The talk test is quite useful in determining your comfort zone of aerobic intensity, especially if you are just beginning an exercise program.
Using this method, the goal is to work at a level where you can answer a question, but not comfortably carry on a conversation. In simple terms, you would be working out too hard if you have to take a breath between every word you say. Conversely, you would be exercising too easily if you could sing several phrases of a song without breathing hard.
Work at an intensity that allows you to breathe comfortably and rhythmically throughout all phases of your workout. This will ensure a safe and comfortable level of exercise. If you are breathless, or can't talk, you're working too hard! Lower the resistance level and slow down. If you experience dizziness or lightheadedness, you may be overexerting yourself and should stop.
The Talk Test has been confirmed as a simple and accurate method of gauging intensity that doesn’t require any equipment or learning. Try your own Talk Test during your next workout (and compare it to your normal heart rate count if you’re skeptical). You may be able to replace your heart rate monitoring with this simple test during all of your workouts, or at least when counting your pulse is inconvenient.