I have three(!)... don't need this one. Isometric exercise was used by the likes of Bruce Lee and Arnold Schwarzenegger. Bullworker is the original isometric training device that has been in production for over 60 years. One device for your entire body. Small size.Easily stored in closet, behind a sofa... Toss it in the car for when you are travelling. More info at: https://www.youtube.com/@Bullworker