GO2 Endurance Workout Device for Improved Breathing and Increased Oxygen Flow while Running, Biking/Cycling, Exercising, Hiking and High Altitudes Made in The USA

This is a piece of plastic. I am a cyclist and this is sooo impractical and limits air intake and air blow out. To me a piece of garbage

AVOID!I bought this after seeing endless adverts in my instagram ads. It arrived and I was disappointed with the whole item. The build quality is terrible for almost £60. Just a thin piece of moulded rubber with a rubber band holding it together. I tried using it while running and got zero benefit from it.

When I was younger I considered myself a runner who rarely dealt with asthma-like hurdles---easily marathon bound. Since then, I became an asthma "sufferer" who takes 2 inhalers twice daily, 2 pills twice daily (to survive) and uses an emergency inhaler for immediate lung support as needed (which was daily). Definitely no marathons happening with these lungs!One day my sis gifted me with my GO2. It changed everything. I could breathe effortlessly, take walks--even run without using my emergency inhaler or fear of suffocation. Most importantly, my lungs feel stronger even when I'm not using this miracle device AND continue to get stronger the more I use it. I no longer worry my lungs will fail me....So on December 8, 2019, I attempted and finished my first marathon. MY GO2 MADE ME A MARATHONER! I still have asthma but no longer "suffer" from it.

Have been using this with a variety of different workouts as I do triathlon training. Have used on indoor biking sessions, runs (short and long), and body weight exercise circuits.From first breath, you become immediately (hyper) aware of breathing patterns, rate, and force. Starts adjusting your mindset to focus on the breathing and let the rest of the workout to take care of itself. Only takes a few workouts to begin getting more and more comfortable using device. I will say, saliva output has definitely increased, but learning to control that more and more as usage increases. Tracking similar routes, efforts, etc. to see physiological changes for long-term benefit. Excited to see progress as the journey continues.

I purchased the device based on the description and reviews. I then went for a run and had the best 2 miles I had in several years. My best average pace without the device was 12:41 for 2 to 3 miles, with the device I was able to do 2 miles at a 10:57 pace and the best mile I have ran in a long time at 10:10. Looking forward to see if this continues.Update: Just shaved 4 minutes off my fastest 5k of 2020. I am loving the device.