New Powerspin Evo Arm, Tricep & Shoulder Workout (Grey/Orange)

Powerspin is a unique, upper-body training device, specifially designed for arm, shoulder and core strengthening and toning. Easy to use and powered solely by the movement of your arm - the faster you spin the internal steel ball inside the Powerspin, the more intense the exercise experience.
Medium speed and short duration for firming and toning; fast speed and long duration to rapidly bui...