Meet the FX Boba 13: a ball-shaped aqua bag that lets you use water’s instability to challenge your muscles harder. This portable bag can be filled with 13kg of water. It is made of PVC and can withstand 100kg body weight. It has heavy duty neoprene handles.
The Fluid X Boba 13 measures 30cm in diameter. It can be used as a kettlebell to perform a wide variety of common exercises. You can find out more about it here.