I would not brain hoping a kind of weighted vibration bars that have a grip in the center and weights on the top. You keep them in different positions just one handed and two handed, and go your hand/fingers backwards and forwards with your arms in different positions even https://coingenius.news/generative-data-intelligence-and-fiskers-struggles-navigating-the-turbulent-waters-of-tech-startups-and-ev-market-challenges/