Milliard Double-Grip Medicine Ball 12 lb.medicine ball has built-in handles at the three o'clock and nine o'clock positions for a firm, easy and comfortable grip during intensive training that involves rotational or explosive movements. Simple to use and easy to integrate into almost any training regimen. Great for use at the gym, in yoga, martial arts, or in your living room. Balance on it, lift it, shake it side-to-side  make it a part of your day any way you can to improve your core strength and to increase your endurence levels. No moving parts to break, batteries to change or long manuals to read. Solid weighted core