Here's how to carry out your own personal exercise stress test (only do these to the maximum exercise level you normally do, or if your doctor says you can do them). You will need to have a method of measuring your heart rate, such as a device that is built into the handles of an exercise machine or a heart-rate monitor that straps on your wrist.
Maximum Heart Rate: After exercising as hard as you can for three minutes, check your heart rate: How close does it come to 80 or 90 percent of the maximum for your age? (Calculate the maximum by subtracting your calendar age from 220: If you're 40 years old, your maximum heart rate should be about 180 beats per minute-80 percent would be 144; 90 percent would be 162.)
Recovery Time: Right at the end of the most strenuous workout you do, note your heart rate. Then stop all exercise (just this once, don't cool down), and check your heart rate two minutes later.
If you achieved at least 80 percent or greater of your maximum heart rate, or if your heart rate declined by 66 or more beats in the two minutes after you stopped, your RealAge is at least five years younger than your calendar age.
Find out more about this book:YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger