A kettlebell includes a kettle member having a pivotal coupling member, and a handle having another pivotal coupling member pivotally engaged with the pivotal coupling member of the kettle member, and the kettle member and the handle include guide members engaged with each other for limiting and guiding the kettle member to rotate relative to the handle along a longitudinal axis of the handle and for preventing the kettle member from pivoting and rotating relative to the handle along the lateral axis of the handle, and for preventing the user from being twisted or hit or hammered or hurt by the kettle member of the kettlebell inadvertently.