You can’t expect to perform to the best of your ability without a strong core. There are plenty of moves you can try to work on your core. The Core Momentum Trainer happens to be an interesting trainer that pushes you to work on your core muscles harder. The CMT is available in 1kg, 2kg and 4kg weights.
The above video just gives you a taste of how the CMT works. The shape of the device and the materials used ensure a force is generated to target your core the proper way. Like what you see? You can find out more here.