Today, we concentrate on sand weighted bags specifically GripR (By Escape Fitness) The GRIPR is ideal for personal training clients . The GripR is solidly built with using micro grade steel sand within a double stitched neoprene bag, It is also perfect for small group training sessions where it can be used for dynamic throwing and explosive catching drills. Progressive and suitable for a wide range of users. The steel sand displaces rapidly, so bags can be placed on the arms, legs and feet. Trains deep core muscles while adding an exciting and unpredictable element to your workouts – your body never knows what’s coming next. Just don’t throw them at each other!