Meet the Finer Form Hall Ball Balance Trainer: a full-body workout device that allows you to work your abs, obliques, and core anywhere. It supports 660lbs of weight. You can perform Squats, Lunges, Burpees, Planks, Side Bends, Push-Ups, and Crunches on this balance trainer.
This balance trainer is core focused. It has a high-grade PVC construction. Costs under $80 at this time.