Imagine 25 to 150 times more oxygen than you ever had before while exercising. When I use it daily for a month I get stronger and stronger and have more stamina. Naps are no longer needed.
Oxygen enhanced exercise and rest has been used for top secret military training as early as 1952. In addition, a man who could not walk up a curb was walking a mile 30 days later. I have seen it improve almost every symptom known to mankind including Parkinson's and ALS.
Using it just 15 minutes a day I wake up rested and my brain function has gotten much sharper. I rarely need to take naps any more.
I personally used it to reduce a full minute off my 1500k race walk time at the senior games, four years older, age 75 and one minute faster.
If I am out of town for week I sense no loss of energy.
Actually I could take it and an O2E2 with me as they both fit into a large suitcase for air travel weighing under 50 pounds total including the suitcase.