Abstract: A core bladder is disclosed. The core bladder a body, a skeletal load-support matrix, and a valve. The body defines a fluid-receiving cavity. The skeletal load-support matrix is disposed within the fluid-receiving cavity. The valve is supported by the body. The valve is configured to permit fluid communication with the fluid-receiving cavity to selectively arrange the body in one of a compact deflated state and an expanded inflated state. An exercise assembly including the core bladder is also disclosed.