Guide to Water Aerobic Weights

Water aerobics is one of the best ways to stay in shape in the pool — and water dumbbells are one of the most effective tools to take your aquatic workout to the next level. Unlike traditional land weights, water dumbbells use the natural resistance of water to build strength, improve muscle tone, and boost cardiovascular fitness — all with virtually zero impact on your joints.

In this guide from the SwimOutlet team, we'll explain how water dumbbells work, their benefits, how to choose the right size, and walk you through the best exercises to get a complete upper body and core workout in the pool.

What Are Water Dumbbells?

Water aerobic dumbbells look similar to their land-based counterparts, but with one critical difference: they're made from buoyant EVA foam or plastic instead of heavy metal. This means they're extremely light out of the water — typically weighing less than a pound — but create substantial resistance once submerged.

How the Resistance Works

Unlike land dumbbells where resistance comes from gravity pulling weight downward, water dumbbells create resistance through buoyancy. When you push a foam dumbbell down into the water, it fights to float back up. When you pull it through the water horizontally, the surface area of the foam creates drag resistance in every direction of movement. This means you get a strengthening stimulus on both the push and pull phases of every exercise — something traditional weights can't provide.

The larger the dumbbell surface area, the more resistance it creates. This is why water dumbbells come in various sizes: smaller buoys for beginners and lighter resistance, larger buoys for advanced exercisers who want a more intense workout.

Benefits of Using Water Dumbbells

Adding water dumbbells to your water aerobics routine provides a wide range of benefits:

• Low-impact training — Water's buoyancy supports your body weight, reducing stress on joints, bones, and connective tissue. This makes water dumbbells ideal for people recovering from injuries, managing arthritis, dealing with joint sensitivity, or who are overweight and need a gentler entry into exercise.
• Full range-of-motion resistance — Unlike land weights that only resist gravity (downward), water dumbbells provide resistance in all directions of movement, engaging more stabilizer muscles and building functional strength.
• Improved muscle tone — Regular use tones the arms, shoulders, chest, back, and core — the muscle groups most targeted by dumbbell-based water exercises.
• Cardiovascular conditioning — Moving water dumbbells at a brisk pace elevates your heart rate, combining strength and cardio training in a single workout.
• Better balance and core stability — Fighting the buoyancy of the dumbbells while maintaining your position in the water engages deep core muscles that land exercises often miss.
• Versatility — Water dumbbells can be used in both shallow and deep water, for upper body exercises, lower body support, and core work. They're effective in organized classes and solo workouts alike.

How to Choose the Right Water Dumbbells

Not all water dumbbells are the same. Choosing the right size and material affects both the effectiveness and safety of your workout:

Size Matters

• Small buoys (approximately 6" diameter) — Best for beginners, older adults, people with shoulder issues, or anyone new to water resistance training. Smaller buoys create less resistance and are easier to control with proper form.
• Medium buoys (approximately 8" diameter) — Good for intermediate exercisers who have built baseline water fitness strength.
• Large buoys (approximately 10–12" diameter) — For experienced water fitness enthusiasts who want maximum resistance. Caution: oversized buoys can force improper form (elevated shoulders, jerky movements) which increases injury risk.

Important: If you're using water dumbbells for the first time, start with the smallest size available and work your way up. Using buoys that are too large is the most common mistake in water aerobics — it leads to poor form and shoulder strain.

Material & Construction

• EVA foam (closed-cell) — The most common and recommended material. Dries quickly, resists chlorine degradation, won't absorb water, and provides a comfortable grip. Look for dumbbells with a padded inner handle for extra comfort.
• Plastic/hard shell — Creates resistance through surface area rather than buoyancy. Less common for pool fitness classes but used in some physical therapy settings.

Water Dumbbell Exercises

The following exercises target all major upper body muscle groups and core. Stand in waist- to chest-deep water for all exercises unless noted otherwise. Perform 1–3 sets of 10–15 repetitions for each exercise, resting 15–30 seconds between sets.

1. Bicep Curls

Muscles targeted: Biceps, forearms

Stand with your arms at your sides, holding a dumbbell in each hand with palms facing up. Keep your elbows close to your torso. Contract your biceps and curl the weights up toward your shoulders, then slowly lower them back down against the buoyancy pulling them upward. The resistance works your muscles in both directions — pushing down against buoyancy and curling up against water drag.

2. Chest Flies

Muscles targeted: Chest (pectorals), front shoulders

Stand with the dumbbells held in front of your chest, arms extended with a slight bend at the elbows, palms facing each other. Pull your shoulders back and sweep your arms out to the sides as if you were opening up for a wide hug. Then bring the dumbbells back together in front of your chest. Keep the movement controlled — don't let the water swing your arms.

3. Tricep Pushdowns

Muscles targeted: Triceps (back of upper arms)

Start with the dumbbells at chest height, elbows bent and palms facing each other. Push the dumbbells straight down toward your thighs, fully extending your arms. Slowly allow the buoyancy to return the dumbbells to the starting position at chest height. Keep your elbows close to your body throughout the movement — don't let them flare out.

4. Karate Punch

Muscles targeted: Chest, shoulders, triceps, core

Hold the dumbbells close to your chest. Punch one arm straight forward through the water, then pull it back while punching the other arm forward. Alternate arms at a controlled tempo. The water resistance tones your arms on both the punch and the retraction. Engage your core to keep your body stable against the rotational force of each punch.

5. Lateral Raises

Muscles targeted: Shoulders (deltoids), upper back

Stand with the dumbbells at your sides, arms straight. Raise both arms out to the sides until they reach shoulder height (or just below the water surface), then slowly lower them back to your sides. Keep a slight bend in your elbows throughout. This exercise builds shoulder strength and stability — essential for daily activities like lifting and reaching.

6. Chest Press

Muscles targeted: Chest, front shoulders, triceps

Hold the dumbbells at chest level with palms facing forward. Push both dumbbells straight out in front of you until your arms are fully extended, then slowly pull them back to your chest. Maintain a stable core to prevent your body from drifting backward with each press.

7. Seated Rows

Muscles targeted: Upper back (lats, rhomboids), biceps

If your pool has a ledge or seat, sit with your arms extended in front of you holding the dumbbells. Pull the dumbbells back toward your torso, squeezing your shoulder blades together at the end of the movement. Then extend your arms back out. This exercise strengthens the upper back muscles that support good posture — especially valuable for people who sit at desks all day.

8. Figure Eights

Muscles targeted: Core, obliques, shoulders

Hold one dumbbell with both hands in front of your body. Sweep the dumbbell through the water in a figure-eight pattern, moving it from one side of your body to the other. The continuous motion with direction changes engages your core and obliques while the water resistance works your shoulders and arms. This is an excellent core exercise that's difficult to replicate on land.

Sample Water Dumbbell Circuit Workout

Try this 30-minute circuit for a complete upper body and core session. Perform each exercise for 45 seconds with 15 seconds rest between exercises. Complete 2–3 rounds of the full circuit with a 1-minute rest between rounds.

1. Bicep Curls — 45 sec
2. Chest Flies — 45 sec
3. Lateral Raises — 45 sec
4. Tricep Pushdowns — 45 sec
5. Karate Punch (alternating) — 45 sec
6. Chest Press — 45 sec
7. Seated Rows — 45 sec
8. Figure Eights — 45 sec

Rest 1 minute between rounds. Repeat 2–3 times.

For a lower-intensity session, reduce to 30 seconds per exercise or drop to 1–2 rounds. For more challenge, increase to 60 seconds or use larger buoys.

Safety & Form Tips

• Start with smaller buoys — Oversized dumbbells force poor form (elevated shoulders, jerky motions) and increase shoulder injury risk.
• Don't hold dumbbells for the entire workout — Alternate between dumbbell exercises and bodyweight water exercises to give your hands and grip a break. Continuous gripping can cause hand fatigue and cramping.
• Control the movement — Don't let the buoyancy yank the dumbbells to the surface. Controlling the return phase is where much of the strengthening benefit comes from.
• Keep shoulders down and relaxed — If you notice your shoulders creeping up toward your ears during an exercise, the buoy is likely too large or you're fatiguing. Switch to a smaller size or rest.
• Stay hydrated — You sweat in the pool even though you can't feel it. Keep a water bottle on the pool deck and drink between sets.
• Consult your doctor before starting a new exercise routine if you have previous injuries, joint conditions, or are recovering from surgery.

Deep Water vs. Shallow Water

Water dumbbells can be used effectively in both depths:

• Shallow water (waist to chest deep) — You stand on the pool bottom with feet firmly planted. This is the most common setup for water dumbbell exercises and provides the most stability. Ideal for all fitness levels.
• Deep water — You're suspended without touching the bottom, typically wearing a buoyancy belt. Deep water dumbbell work adds a significant core stability challenge since your body must work to stay upright with no ground contact. Best for intermediate to advanced exercisers.

Other Water Aerobics Equipment to Pair with Dumbbells

Water dumbbells are just one piece of a complete aquatic fitness toolkit. Combine them with other water aerobics equipment for a more varied and complete workout:

• Foam noodles — Versatile buoyancy aids for core exercises, leg work, and balance training. A cut noodle section can even substitute for dumbbells in a pinch.
• Buoyancy belts & vests — Essential for deep water aerobics. Keep you afloat so you can focus on exercise form rather than treading water.
• Kickboards — Great for lower body isolation exercises like flutter kicks and leg extensions.
• Water resistance gloves — Webbed gloves that increase hand surface area for added upper body resistance during arm movements.
• Ankle weights & resistance bands — Add lower body resistance to water walking, leg lifts, and squat exercises.

Shop All Water Dumbbells & Barbells →

Shop All Water Aerobics Equipment →

FAQs

What are water dumbbells made of?

Most water dumbbells are made from closed-cell EVA foam, which is buoyant, lightweight, chlorine-resistant, and quick-drying. Some models use hard plastic shells. The foam construction means dumbbells feel nearly weightless on land but create significant resistance when pushed through water, thanks to their buoyancy and surface area.

How do water dumbbells create resistance?

Water dumbbells work through two mechanisms: buoyancy resistance (the foam fights to float upward when you push it down) and drag resistance (the surface area creates friction as you move the dumbbell through the water in any direction). This provides resistance on both the push and pull phases of every exercise — unlike land weights which only resist gravity in one direction.

What size water dumbbells should I get?

Start with smaller buoys (approximately 6" diameter) if you're a beginner, have shoulder issues, or are new to water exercise. Medium (8") buoys suit intermediate exercisers, and large (10–12") buoys are for experienced users who want maximum resistance. Using buoys that are too large is the most common mistake — it forces poor form and increases injury risk.

Are water dumbbells good for arthritis?

Yes — water dumbbells are excellent for people with arthritis and other joint conditions. The buoyancy of the water supports your body weight and reduces joint stress, while the resistance from the dumbbells still allows you to build strength. Multiple studies have shown that water-based exercise significantly improves mobility, reduces pain, and enhances quality of life for people with knee osteoarthritis and other joint conditions. Always consult your doctor or physical therapist before starting a new exercise program.

How often should I do water dumbbell workouts?

For general fitness, 2–3 water dumbbell sessions per week is a good starting point, with rest days in between to allow muscle recovery. Because water exercise is low-impact, many people can train more frequently than they could with land-based weights. Listen to your body — if you feel excessively sore, add more recovery time between sessions.

Can I use regular weights in the pool?

It's not recommended. Traditional metal weights are difficult to control underwater, can damage the pool surface, and don't provide the same type of resistance that water-specific foam dumbbells do. Metal weights also rust when exposed to chlorinated water. Always use equipment specifically designed for aquatic exercise.

Do I need to know how to swim to use water dumbbells?

No — most water dumbbell exercises are performed while standing in waist- to chest-deep water. You don't need to swim or even put your face in the water. For deep water exercises, a buoyancy belt keeps you afloat. Water aerobics is one of the most accessible forms of exercise for non-swimmers.

This guide is written and maintained by the SwimOutlet swim team. Water aerobics and aquatic fitness information is based on established exercise science principles. Always consult your doctor before beginning a new exercise program, especially if you have previous injuries or medical conditions. For more fitness resources, explore our beginner swim workouts guide and our water temperature guide.