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 ...

Ask a physical therapist how you can subtly level up your workouts, and they’ll probably recommend trying the best BOSU balls (and other types of balance trainers). If you’re unfamiliar, BOSU stands ...