2-in-1 Hybrid Kettlebell System: The super-versatile FITT Bell can be used as two individual kettlebells or combined together into a hybrid barbell for incredible workout versatility. Fully adjustable: Each FITT Bell can be filled with up to 8kg (8L) of water, perfect for virtually any fitness level. Simply fill it to the level that’s right for you – 1 litre of water weighs 1kg, it’s that simple. As you progress, use more water to keep improving. Dynamic Fluid Resistance Training: The constant movement of the water acts as a ‘live’ weight, adding instability to your workout so every rep is different. This helps increase core activation, strengthening your abs and obliques, and improving overall core stability. Total body workout: Target every muscle in your body with a whole range of exercises to work your arms, shoulders, chest, back, abs, glutes, hamstrings, quads and calves. You’ll even get your heart pumping and those calories burning in just minutes a day! Ingenious space-saving design: FITT Bell replaces up to 8 different kettlebells, all in one, compact and fully deflatable package. And, when empty, it’s lightweight and easy to transport for workouts on the go! Gym quality construction: Made with durable, extra-thick PVC, FITT Bell is built to stand up to high-intensity workouts and is perfect for using indoors or out.