Hands up if you see the Bosu ball at the gym but you’re not quite sure what to do with it? Or maybe you have one sitting idle at home, gathering dust. If so, you’re not alone. I’m a fitness editor and ...

The Bosu ball, whose name stands for "Both Sides Up," is a unique training tool that lets you work on both stability and instability. Its clever design forces you to engage muscles you might not even ...