There are plenty of standard dumbbells and kettlebells you can buy to exercise indoors. The Surge Hydro Ball (HB25) is a water filled training tool that provides instability to target more muscles in your body. You can use it as a kettlebell, slam ball, and medicine ball.
More gadgets like this: here
The weight can be adjusted up to 25lbs. You can find out more about it here.
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