Kettlebells and barbells are great tools for strength training. The FITT Bell by New Image is an adjustable set of kettlebells that you can fill with water to add an element of stability to your workouts. When combined, they act as a hybrid barbell for strength, core, and balance training.
FITT Bells can be filled with 8kg of water. They replace up to 8 different kettlebells and can be used indoors and outside. A workout chart with 19 exercises is included with each set.