The GoSports Core Hub is a great way to get full body workout while having fun. The pivot plank board targets core muscles to help focus on full body muscle activity. The 360 degree range of motion allows users to target arms, legs, core and back muscle groups. The lightweight and portable design makes it easy to get a workout in anywhere - home, gym or the office! Hand guards located under the board help protect your hands while shifting plank positions for worry-less workouts. The Core Hub also features a built-in smartphone holder compatible with most standard smartphones, so that you can workout while watching videos or to combine with fitness game apps. The non-slip pad helps keep your phone in place so you can plank and play without worry. We recommend searching online for planking fitness games or looking in your app store to find apps that are compatible with your smartphone.   Special Shipping Information:  This item ships separately from other items in your order.  This item cannot ship to a P.O. Box.  This item may be subject to additional processing days.   Item is not eligible for expedited shipping.    You may initiate a return for unused items within 30 days, if the items are in original packaging with all original materials included with the shipment.