The Hypersphere Go is great for improving grip strength, flexibility, range of motion, and circulation. It is great for travel and on-the-go, targeting your tightest areas to unlock the body and help you move better. Even better for travel than the regular sized Hypersphere this tool is a compact 3.5 inches in diameter, weighing 0.75lbs, and approved by TSA for carry-on. With up to 2 hours of use per charge you are able to activate, soothe, or loosen muscles in the feet, calves, hamstrings, glutes, hip flexors, shoulders, back, and forearms