Adjustable Weights for Group Fitness Classes

A refillable water-filled weight that works like a kettlebell or dumbbell. Fill it with tap water to the weight you want, and empty it when you're done.

Each weight adjusts from 1 to 11 lb (0.5–5 kg), and a set of 2 gives you up to 22 lb combined. Empty, each weighs just 0.8 lb (about 360 g).

Each weight measures 12.3 in long, 4.7 in wide and 13.7 in tall (31.2 × 12 × 34.7 cm), or roughly 12.5 × 5 × 14 in. It's slim enough for a closet shelf or a backpack.

Fill lines in both lb and kg are molded into the jug, so they won't wear off. Each line shows the total weight, including the 0.8 lb jug, and the slightly translucent body lets you see the water level as you fill.

No. The plug-seal cap locks watertight and the plastic is thick and durable. Reviewers consistently report zero leaks.

Very. It's made from high-density polyethylene (HDPE), the same kind of tough plastic used for toolboxes and motor-oil bottles, chosen for its impact strength and resistance to cracking. It also stays tough in the cold rather than turning brittle. Just empty it before leaving it somewhere below freezing, since water expands as it freezes.

The top handle and two side handles give you multiple grip options. Hold it one-handed like a kettlebell, or grip both sides for crunches, squats and Pilates. That means more exercises than a single-grip weight allows.

Each handle is 1 in (2.5 cm) in diameter, about the same as a standard dumbbell handle. The smooth plastic is easy to wrap your fingers around, with no knurled metal to rub your palms.

Yes, and that's a good thing. As the water shifts, your muscles work to keep the weight steady, which adds core engagement and focus to every move. Customers say it helps them concentrate and control their form. Slow, controlled movements work best.

You can work your whole body: arms, chest, back, abs, glutes and legs. Examples include squats, lunges, weighted crunches, hip thrusts, swings, lateral raises and Pilates. The free interactive exercise library at cards.aguaforce.com shows how to do each one, sorted into upper body, core and lower body sections with the target muscles highlighted.

Go to cards.aguaforce.com on your phone, tablet or computer. Use it right in your browser, or use the install option on the site to add it to your home screen like a regular app. No app store needed.

AguaForce comes with a 30-day money-back guarantee. If it breaks within 30 days, you get your money back.

Empty it after each workout and let it air-dry with the lid off before storing. Wipe the handles with a damp cloth as needed, and between users if you share weights in a class. Refill with fresh tap water each session.

For fast or swinging moves, keep your hands dry or wear workout gloves to maintain a secure grip.

Add a little more water. You can increase in small steps instead of jumping from 5 lb straight to 8 lb, which makes steady progress easier.

Yes. You can use it empty or with very little water, which makes it easy to start light and build gradually at your own pace.

Aquatic instructors report that the handles are easy to grasp for both younger and older users, including people with arthritic hands. Holding it with both hands on the side handles spreads the load and gives you more control.

Yes. Many upper-body moves, such as curls, overhead presses and lateral raises, can be done from a sturdy armless chair. It's a comfortable way to start, or to keep training on days when standing feels like too much.

Yes. One weight covers 1 to 11 lb, so a single set works for a mixed-level class. Each participant fills to their own resistance, and you don't need a rack of fixed weights in every size.

Yes. Online orders come in sets of 2, but wholesale orders can be any quantity, so you can equip a whole class. Request a price on the AguaForce website.

Empty, each one weighs under 1 lb, so you can carry a class set in a bag instead of hauling cast iron. Fill them on-site from a tap or water jug and pour them out when class ends.

Strength, toning, Pilates, core, low-impact and active-aging classes are a natural fit. The range covers squats, lunges, weighted crunches, hip thrusts, swings, lateral raises and Pilates moves, and the three handles let you cue one-handed and two-handed variations.

Make it part of the lesson. Cue slow tempos, controlled lowering and a braced core so participants keep the water steady. It naturally draws attention to form and turns basic moves into stability work. Save faster swings for participants who have the control to handle them.

Yes. Clients can own one weight that grows with them instead of a drawer of dumbbells. You can prescribe exact fill levels using the molded lb and kg lines and progress them in small steps between sessions.