What elite endurance athletes know that most runners dont
Ask a weekend runner what limits their speed and they will talk about their legs, their lungs, or their fitness. Ask an elite endurance athlete and you will hear a different answer: it is how efficiently you move oxygen through your body, and how calm your heart rate stays while you do it. That is the edge GO² was built to deliver.
GO² is the only breathing device scientifically proven to increase oxygen and endurance while lowering heart rate. It is patented technology, designed by doctors, and made in the USA. In testing, athletes saw endurance gains of 6% and VO₂ max gains of 4%. For a runner, that is the difference between hanging on and breaking through. For an IRONMAN athlete, it is hours of sustained effort at a lower cost.
From the summit to the finish line
Elite athletes across sports have made GO² part of their race-day kit:
- Joseph Gray, World Mountain Running Champion, pushes through courses where the air thins and the climbs never end. Efficient oxygen delivery is not a nice-to-have at altitude — it is the race itself.
- Don Bowie, a professional high-altitude climber, operates where every breath counts and heart rate control is the difference between summit and turnaround.
- Ricardo Urbina, a 24-time IRONMAN finisher, spends 8 to 17 hours on a single course. Over that distance, breathing efficiency compounds: small savings per breath become huge savings by mile 26.
- Laurel Wassner, a 3-time IRONMAN champion, races at the sharpest end of the field, where seconds separate the podium from fourth place. A lower heart rate at the same pace is free speed.
These athletes did not pick GO² because it looks interesting. They picked it because it is the only breathing device with proven results — patented, tested, and trusted by people whose livelihoods depend on performance.
The pattern across every sport
Notice what mountain running, high-altitude climbing, and IRONMAN racing have in common: they are all won and lost on oxygen economy. The athlete who delivers more oxygen per breath at a lower heart rate can sustain pace longer, recover faster between surges, and finish stronger. That is exactly what GO²s +6% endurance and +4% VO₂ max mean in practice — not a lab number, but a real, felt advantage deep into a race.
You do not need to be a world champion to use the same tool they do. GO² fits comfortably during training and racing, it is WADA legal, and at $60 it costs less than a single pair of racing shoes that will wear out in a few hundred miles. There is no expiration date on your breathing efficiency.
Race like the best
Your legs can only do what your breathing allows. Give them the oxygen economy the pros rely on.
Get your GO² for Endurance today and breathe like an athlete who refuses to fade.