The commercial arguments developed around this power balance bracelet is actually howling with laughter. It would not even be credible in a Star Wars comic.
However, it is quite possible to study the matter a scientific perspective.
1-No scientific phenomenon is mentioned. Jargon rambling on magnetism does not contain a word with any meaning.
2-What is claimed is that it improves balance. So first step, see the phenomenon.
3-If a problem is found, you're a hypothesis to explain it. Here, given the pipotronesque of the thing, I think the most constructive hypothesis to be tested is the simplest: it is the use of the power balance wristband that causes the phenomenon.
4-The phenomenon is the domain of the human being, you'll test it by double-blind test. Fake bracelets should be mixed at random with real, and tests must be conducted by an operator who will use the numbered bracelets not knowing which ones are real and which are false. Nobody needs to know in the same room what are the real and fake bracelets. It has repeatedly shown that even without saying anything, the only light, a voltage imperceptible facial muscles may unconsciously influence the guinea pigs. Search for information about the effect power balance band "Clever Hans".
5-You will need depending on the duration of a test and the number of guinea pigs testing protocol is best. The aim is that the number of positive results obtained on real vracelets can not be due to chance. Look for example the principle of ABX tests.
6-The goal is not to achieve success at any cost. A test failure is also a scientifically valid result.
