Meet the ROCK 360 Abdominal Trainer: a handy tool designed to help you work on our abs. It is based on the concept of the ab wheel but offers you 360-degrees of movement. You can pair the ROCK 360 trainer with your iPhone or Android phone to stay on the right track. This tool helps you target 29 muscles of the core. It works on most surfaces. You can do rolling obliques, twisting planks, and 360-degree sit-ups with it. Sets you back under $90.
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