Consider working out with a medicine ball, an inexpensive fitness tool that's exploding in popularity. This weighted ball helps you develop strength, endurance and even flexibility and many exercises are done with a partner, adding a fun dimension to workouts.
Medicine balls come in a variety of sizes, from tennis- to basketball-size, and from 1 to 50 pounds and up. For solo exercises, you might like one with handles.
Source: Medical Xpress