This adjustable-weight strength tool from Kamagon adds new challenge and versatility to your home and travel workouts.
Fill the ball with water to the desired weight (from 15 to 45 pounds; lines indicate measurement) and use it for everything from kettlebell snatches to plyometric frog jumps. Double handles support one- or two-handed moves. Heavy-duty latex holds up well under pressure. $150 at www.kamagonball.com.