XBR360 X-Treme Body Rockers Perfect wrist positioning in any grip (standard, wide grip, diamond, dive bombers) Rocking surface allows for increased chest expansion at the bottom and tighter squeeze at the top Rocking surface also engages stabilizing muscles to create a more intense and complete workout Broadest range of motion of any handle on the market today  allows 100% lateral arm extension Doctor endorsed to reduce joint pain, improve balance, engage core and stabilizers, protect your wrists No more caveman, flat hand pushups, planks, and burpees! XBR&#039;s move throughout the FULL range of motion allowing your wrist position to be optimized. The rocked surface provides just the right amount of instability to recruit and engage stabilizing muscles and your core. XBR360 intensifies exercises - more results in LESS TIME Engages your core and stabilizing muscles Increases range of motion