Here is a water-filled power bag that can work more muscles in your body. The Tidal Tank is great for core, strength, and balance training. You can fill it with up to 45 pounds of water. As you move the Tidal Tank, the water shifts from one side to another, which leads to more muscles in your body getting activated.
The Tidal Tank weighs 3 pounds when empty, measuring 2 by 5″ when folded up. A training center with over 30 videos is available to help you get more out of this exercise tool.