The hand spring is an innovative fitness accessory designed to strengthen the muscles of the hands and forearms. You can use all your fingers, including your thumb. Training with this spring clamp will significantly increase your strength. The hand springs feature an ergonomic soft foam structure that ensures a comfortable grip. The product is lightweight and portable, making it easy to carry in your bag or backpack. You can even train while watching TV. It allows you to improve your performance in various areas such as gymnastics, motocross, climbing, or weightlifting.