Powercore Strongman Bag 200Lbs*Powercore Strongman Bags Sand Bags The Powercore Strongman Bags (often referred to as Sand Bags) are a highly effective tool for developing **functional strength**, power, and endurance. These rugged bags are designed to be filled with sand (sand not included) to create an unstable load, forcing the user to engage their **core and stabilizer muscles** throughout every lift, carry, squat, and throw. They are essential for challenging strongman style