You know the feeling of being exhausted from simply being in the sun all day? The sun rays give off positive ions which make you feel that way. On the flip side, ever been outside right after a thunderstorm? Feels great right!?
That's because there are negative ions in your environment. Notably for those who exercise regularly, lactic acid is known to produce positive ions, so you can now counteract this with negative ions from your wristband to keep you energetic with more focus! Some speculate it may even help with recovery time!