Core Flyte Pro V3 - Increase Athletic Performance, Build a Rock-Solid Core & Activate More Muscle (Pair, Online Workout Videos, Carrying Case + Guide) Very portable: Lightweight, durable and easy to store. For all fitness levels: Adjust the difficulty by using on surfaces with more or less friction or changing the range of motion. Used by elite athletes, including NFL players, to improve performance, as well as older adults to rehab injuries -- and everyone in between. Truly multi-surface: Moves well on any flat surface, including non-slip rubber gym floors, carpet and hardwood. Inspires creative workouts: Introduces a completely new type of mechanics to popular exercises, and provides a platform for the innovation of new exercises. Innovative technology: Uses patented ball transfer technology inspired by the aeronautics industry to facilitate omni-directional movement.