I Wouldn't intellect trying a kind of weighted vibration bars that Use a grip in the middle and weights on the tip. You hold them in different positions a single handed and two handed, and move your hand/arms forwards and backwards with your arms in different positions even though https://coingenius.news/enhancing-ai-trustworthiness-with-confidential-federated-learning-safeguarding-privacy-and-security-in-the-age-of-generative-data-intelligence/