- Unique patented design works grip, wrist and forearms
- Shifting sand provides active resistance for stabilizing core muscles
- Alternative to medicine balls, kettle bells, dumbbells, etc.
- Safer and easier on people and floors than metal weights
- Sold unfilled; simply fill with dry all-purpose sand
- Unique patented design works grip, wrist and forearms
- Shifting sand provides active resistance for stabilizing core muscles
- Alternative to medicine balls, kettle bells, dumbbells, etc.
- Safer and easier on people and floors than metal weights
- Sold unfilled; simply fill with dry all-purpose sand