The MostFit Core Hammer is a fitness sledgehammer. In case you hadn't heard, sledgehammer workouts are a thing now. Rrrawwwrrr! Typically they entail using a sledgehammer to beat the ever-loving rubber treads out of giant truck tires in the name of dynamic cardio and core training. But the MostFit Core Hammer eliminates the need for the tire, saving you the cost of the tire and the space to store it. And the tire the regular bludgeonings.
MostFit recommends its Core Hammer for everyone from athletes to Cross-Fitters to "casual exercisers." I'm not so sure about that last one. Even though the end of this Hammer holds a big rubber ball instead of a metal head, and even though it comes in relatively manageable 8- and 12-pound weights, I can see one too many "casual" back injuries and "casual" losses of grip on the way up to recommend a Core Hammer workout to an inexperienced user.
What would be fun though is getting some friends together, having a few drinks, and using it as a pinata bat.