I Bell

Introducing the I Bell — a simple tool designed to develop forearm strength, endurance, and stability. Shaped like a loadable dumbbell, but with one sleeve replaced by a spherical grip, this trainer allows you to position your hand at any angle. The sphere acts as a free-grip surface, letting you rotate and adjust your hold to selectively engage specific muscles in your forearm. By controlling the wrist angle and resistance direction, you can train flexion, extension, pronation, supination, and grip strength with precision.

Unlike traditional dumbbells that lock you into fixed wrist movements, the Forearm Sphere Trainer provides dynamic variability — making it ideal for athletes, martial artists, climbers, and lifters seeking well-rounded forearm development and injury resilience.