A revolutionary tool that allows you to monitor training intensity in real time, without the need for lactate testing or laboratory tests.

Training in the right effort zone no longer requires lactate testing, blood work, or lab visits. With ZoneSense , Suunto offers a revolutionary tool that changes the way athletes—both amateur and professional— monitor the intensity of their training , in sports such as trail running, cycling, skiing, and more.

Available on the latest Suunto watches , ZoneSense works in conjunction with a heart rate strap , analyzing heart rate variability (HRV) in real time to deliver an accurate and dynamic reading of your exercise effort. It does this without prior calibration or external testing, automatically adjusting to factors such as accumulated fatigue, stress, weather, and even your menstrual cycle.

Thanks to its real-time detection system, ZoneSense identifies whether the body is working in an aerobic, anaerobic, or near VO2 max zone, helping you maintain optimal intensity to efficiently achieve your goals . The technology behind this innovation was developed by MoniCardi, a scientific spin-off from the University of Tampere, specializing in advanced cardiac behavior analysis.

In addition to its technical rigor, ZoneSense has been designed to be intuitive. With just a glance at the watch, athletes can see how their body is working, whether running, cycling, skiing, or swimming. Three zones, three colors, and a clear visual guide to regulate effort without having to interpret complex metrics.

Joan Solanas: “ZoneSense simplifies an athlete´s life and improves their performance.”
To provide more context on its usefulness, we spoke with Joan Solanas, a certified physical trainer specializing in endurance sports, who has already tested ZoneSense with his athletes during training to prepare for their competitive challenges.

“For coaches, it´s easy to analyze workload with data on a computer, but for runners—amateurs and pros —ZoneSense is a killer tool ,” he explains. “ It allows you to regulate exercise intensity in real time, clearly and easily . Three zones, three colors, and that´s it. That makes the athlete´s life much easier,” he emphasizes.

According to Solanas, one of the ZoneSense´s greatest strengths is that it doesn´t just display a heart rate number: "Heart rate alone may not accurately reflect exertion. We´ve all had days when our pulse doesn´t rise as we expected, but we feel like we´re pushing our limits. With ZoneSense, that intensity is reflected on the screen, thanks to its heart rate variability measurement."

Furthermore, this coach and long-distance runner points out that one of the most common trends in the running world is training too intensely. “It´s something I see every day. With ZoneSense, you can better control this excess, and in the long term, that translates into improved performance and fewer injuries ,” he concludes.

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  Suunto Smart Heart Rate Sensor