Michael Conlon
Founder of Finish Line Physical Therapy

"For endurance athletes, Frontier X is a game-changer that impacts optimal training load and performance by measuring breathing rate, the most important variable in training. For anyone who exercises, the additional measurement of overall heart health is a potential life changer."

Yash Muthiyan
Running Blogger and Regular Marathoner

"Heart rate tells only a small part of the story. Real effort depends on breathing rate and cardiac strain, amongst other factors. Frontier X gives me a detailed ECG for every run and helps me keep track of my training load based on real effort."^*

Ross McGraw
Team USA Triathlete

"When I was first introduced to Frontier X I dove into what data it could provide, the metrics and the technology. What I did not anticipate was that using Frontier X would actually make me a better and more mindful athlete."

Paul M.
Frontier X User

"The Frontier X is for anybody who wants to understand how hard they are pushing themselves during training, in a way that is more meaningful than just measuring heart rate. It will also help to ensure that your easy runs are easy by an objective measure. As someone who is medically trained and also trying to improve their fitness, I see this as an exciting development."

Budd Coates
4-time Olympic Marathon Trials qualifier

"I’m a true believer that perceived exertion is the best way to monitor your effort and that paying attention to your breathing, paired with stride cadence, is the most efficient way to judge effort. Frontier X offers real-time feedback on these components allowing the athlete to hone in on the perfect pace for the distance being raced or the workout being run."

Jonathan Cane
New York City endurance sports coach

"Heart rate, pace relative to race intensity, and quite often an athlete’s subjective rating of perceived exertion have long been methods of gauging a workout’s intensity. While each can be helpful, they also each come with their respective inherent flaws and limitations. Frontier X is the first product to provide the ability to monitor breathing rate and thus gauge intensity using practical and scientifically justified methodology."

"It gives a double buzz when you are subjecting yourself to cardiac strain, which means the heart muscle is not getting enough oxygen..."

"Rather than just beats per minute, the chest-mounted computer measures and records the functioning of the heart and lungs and generates a continuous ECG graph."

"It was built to solve long-standing problems that athletes have had for decades. Am I training and racing at the optimum intensity level?
Am I pushing my heart too hard?"