https://www.scientificamerican.com/article/is-brain-stimulation-the-key-to-athletic-performance/

Halo Sport is a brain stimulator that claims to helps you develop muscle memory faster. On their website, they say: 

And all of this is backed by 4,000+ peer-reviewed studies, trusted by NFL, NBA, MLB, and Olympic athletes. The company has more than 20 patents issued to them.