Adjustable kettlebells are nothing new. We have covered a bunch of them that can give you a tough workout. The Rock Solid 7-in-1 Kettlebell is also worth a look. It has a compact design with adjustable weight using plates. You can adjust the weight from 10 to 40 pounds.
To adjust the weight, simply put your thumb in the circle on the top and slide it towards you. Rotate the lever to the right to unlock to remove or add plates. This adjustable kettlebell has a flat base for easy storage.