From simple swings to more complex workouts, a kettlebell is a seriously versatile piece of equipment.

Training with kettlebells offers a unique combination of resistance and aerobic training— generally with little to no time between reps— which helps raise your metabolism and torch fat.

But while most gyms stock dumbbells in a wide range of weights, you can usually only find a handful of kettlebells. It’s hard to stick to a routine when you reach for a heavier weight and someone else is using it or it's not there in the first place.

One solution is, of course, to invest in a your own kettlebells. Another—much more economical— option: Kettle Gryp ($34.95), a handle that turns almost any dumbbell into a kettlebell. Simply clip it around the dumbbell of your choice (it’s designed to work with weights up to 55 pounds) and begin your workout.

With this handy device, you can take your kettlebell workout with you wherever you go. Weighing in at less than a pound, you can throw the made-in-the-USA Kettle Gryp in your gym bag, and it won’t add a ton of weight when attached to your dumbbells. Once you get one, put it to the test with this 21-minute kettlebell workout.