SHAKE WEIGHT Dumbbell-Style Hand Weight

Shake Weight, a dynamic inertia-based dumbbell designed for upper body toning.  Design: Features a contoured green grip handle with weighted, spring-loaded ends encased in chrome and bright green accents.  Function: Uses patented dynamic inertia technology to supposedly engage muscles in the arms, chest, and shoulders through rapid shaking movements.If you want, I can tell you:  How it works according to fitness studiesEffective exercises to use with it   Bright green hand weight designed for everyday home workouts. Lightweight and ergonomic for a comfortable grip. Durable construction supports a variety of strength and toning exercises. The green finish adds a lively accent to your home fitness gear.