How I tested Oxygen:

I tested the oxygen from Oxygen4energy.com over a week of interval training. I took 10 shots before each training session and 10 shots immediately following each training session. If the training session was longer than 40 minutes, I would take 10 more shots about half way through the workout.

My results:

From the very first workout, I noticed immediate benefits using oxygen. I felt like I had greater endurance throughout the intervals and I recovered MUCH faster between intervals. I also felt much better after these intense workouts (later in the day) - Less overall heaviness and fatigue in the legs. On the 4th day of testing, we did a very tough 7 x 60 interval session. On this day, we timed every interval as accurately as possible. My times got faster every interval and I was able to run the fastest times EVER in training. I also noticed that if I came to training not feeling great, I was still able to turn in productive workouts - much better than I would expect considering how I felt.

My Conclusion:

This product is a very beneficial one which has allowed me to train great. I have been able to produce great times even in the course of not feeling great going into a workout. I also believe that this product will allow one who would like to get extra reps in to do so. I recover faster from workouts and feel good at the end of workouts.