The present disclosure concerns an exercise device, and more particularly a combination balance and stability training and resistance training exercise device, comprising a platform and a balance element. The exercise device can also comprise one or more resilient, elongate resistance training elements for resistance training. The exercise device can be provided with a stabilizing device. When removed from the stabilizing device, the exercise device can be used in a manner similar to a conventional balance board. When mounted on the stabilizing device, the exercise device is supported in a stable orientation for performing exercises requiring a stable and balanced support surface.