Here is a set of kettlebells that you can fill with water and use for weightlifting and core training. The New Image FITT Bells are adjustable water kettlebells that can be filled with up to 8kg of water. Since the water moves as you exercise, it adds instability to your workouts.
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The FITT Bell is made of extra-thick PVC. They ship with a chart that guides you through 19 exercises. These can be used alone or combined for more challenging workouts. You can find out more about it here.
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