ProsourceFit Toning Balls are the perfect combination of building strength and improving flexibility, bringing the benefits of Pilates into regular workouts. The unique design of these PVC mini balls creates a more comprehensive workout experience and doubles as a physical therapy tool. Use these mini weighted balls during strength training exercises, lean against it during core work for back and spine support or use as a destabilizing surface and weight. These natural sand filled exercise balls create instability during exercises for maximum challenge, engaging various muscle groups at once to help you get a leaner and more toned body. Fitting perfectly in the palm of your hands, between ankles, thighs or hamstrings, these weighted toning ball make targeted strength training easier and more effective. Choose the right level of resistance for you to start shaping and sculpting!