I would not mind attempting a type of weighted vibration bars that Have got a grip in the center and weights on the top. You maintain them in several positions a single handed and two handed, and move your hand/palms backwards and forwards with your arms in different positions https://coingenius.news/generative-data-intelligence-and-fiskers-struggles-navigating-the-turbulent-waters-of-tech-startups-and-ev-market-challenges/