The dumbbell needs no introduction. They come in

The dumbbell needs no introduction. They come in a range of sizes and materials to fit any workout and training. For the enthusiast, you can even find blocks of dumbbells that neatly stack on top of each other. Do sets on your yoga ball, or invest in a bench. Try: Hampton Fitness Jelly Bells, $23-$62.

(Credit: Hampton Fitness)

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