Powertrain Yoga Stability Disc Home Gym Pilates Balance Trainer - BlueImprove posture, build strength, balance, and engage your core by adding an element of instability to your workout with the Stability Disc. This PVC inflatable disc offers an unstable sensory stimulating cushion to improve balance, proprioception, and strengthen the deep core stability muscles as the body adjusts to maintain balance. One side of this 34. 5cm disc is densely dotted while the other side is scarcely dotted so as to provide different