HIIT can be intimidating for beginners, but it doesn't have to be! Here's how you can get started with high-intensity interval training.

If you and your child are searching for a good experiment for your local school district science fair and you�ve never done one before, don�t panic -- there are many experiments you can choose from.

The long-used formula for determining a person�s maximum heart rate, 220 minus age, is still considered useful for estimating a man�s rate, but it tends to overestimate the maximum heart rate of women.

Heart rate and age are necessary components in estimating your heart's response to exercise. Heart rate is the number of times your heart beats per minute.

The heart rate you should aim for during cardio workouts is 50 to 90 percent of your maximum. Determine your max heart rate using easy formulas.

Experienced or beginner, if you find your average heart rate while running, you will get better, healthier results. Using your heart rate when running is an effective way to gauge your intensity effort.

Aerobic exercise has been used by humans for millennia to promote health and happiness, as well as looks. Classes began in the 1970s and have progressed since.

Your heart�s ability to return to normal levels after physical activity is a good indicator of fitness. A healthy heart will recover quickly in the first three minutes after stopping exercise.

Whether you are at rest or exercising, physiological functions must remain within a narrow range for you to survive. Negative feedback loops work to keep physiological parameters such as heart rate within this target range, or homeostatic set point.

Running is generally defined at a pace of at least 10 minutes per mile. Anything slower is defined as jogging. Runners who race can determine their maximum heart rate by taking 220 and subtracting their age. Generally racers calculate a percentage of this maximum heart rate to plan their workouts.

As a runner, you expect the occasional aches and pains like muscle soreness and blisters. But a foot that goes numb when you�re running is a strange sensation. You are undoubtedly used to the feeling of your foot �falling asleep� when you sit cross-legged on the floor too long.

Heart rate zones are based on your maximum heart rate. The higher your heart rate, the more intense your workout is.