Training with water is a great way to add an element of instability to your workouts and work your muscles harder. Take the HydroCore Bag: it is a water filled Bulgarian bag that helps you build strength and develop explosive movement in your body. It gives your body instant feedback as you swing it to activate more muscles and help you burn more calories.
More gadgets like this: here
You can find the HydroCore Bag on Onnit. More info is available here.
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