Is "220 minus age" an accurate way to find my max heart rate?

It's a widely used population estimate but has meaningful individual variation — a supervised maximal exercise test provides a more accurate number if precise training zones matter for your goals.

Why does the Karvonen method use resting heart rate?

Incorporating resting heart rate accounts for your individual cardiovascular fitness level, producing training zones more personalized to you than a formula based on age alone.

Should most of my training be easy or hard?

Many exercise researchers and coaches suggest a "polarized" approach where the majority of training volume happens at an easy, conversational intensity, with a smaller portion at genuinely hard effort, and less time in the ambiguous moderate zone.

How to Calculate Your Target Heart Rate for Exercise

Why Heart Rate Zones Matter

Different exercise intensities produce different physiological adaptations. Training too easy for too long limits fitness gains; training too hard too often increases injury and burnout risk and can actually limit aerobic base-building. Heart rate zones give a practical, personalized way to gauge intensity beyond just perceived effort.

Estimating Your Max Heart Rate

The most common formula is 220 minus your age, giving a rough estimate of maximum heart rate. This is a population average with real individual variation — a supervised fitness test provides a more precise number if you need accuracy for serious training.

The Karvonen Method: A More Personalized Calculation

Rather than using a flat percentage of max heart rate, the Karvonen formula incorporates your resting heart rate for a more individualized target:

Target HR = ((Max HR − Resting HR) × Intensity%) + Resting HR

This accounts for your baseline cardiovascular fitness (a lower resting heart rate generally indicates better cardiovascular conditioning), producing zones tailored to you rather than a generic age-based estimate alone.

Common Training Zones

Zone 1-2 (50-70% of heart rate reserve): Easy, conversational pace — builds aerobic base, used for recovery and long, easy sessions.
Zone 3 (70-80%): Moderate, "tempo" effort — sustainable for a while but noticeably challenging.
Zone 4-5 (80-95%+): Hard to very hard effort — builds speed and top-end fitness, but not sustainable for long durations and should be a smaller portion of total training volume for most people.

Why Most Training Should Be Easier Than People Think

A common finding among endurance coaches and exercise researchers is that many recreational athletes train too much in the "moderate-hard" zone and not enough at truly easy intensities — an approach sometimes called "polarized training," where the majority of volume is easy and a smaller portion is genuinely hard, with less time spent in the ambiguous middle zone.

Practical Ways to Monitor Heart Rate

Chest strap monitors are generally more accurate than wrist-based optical sensors, especially during high-intensity or highly variable efforts, though wrist-based devices have improved significantly and are convenient for everyday training. Either is far more useful than guessing intensity by feel alone, especially for beginners still calibrating their sense of effort.

This article is provided for general informational purposes only and does not constitute financial, tax, legal, medical, or professional advice. Always verify important decisions with a qualified professional or official source.