The most efficient way to tread water is the eggbeater kick, a technique borrowed from water polo that uses about 20% less oxygen than flutter kicking or running in place. Combined with proper body positioning, breathing control, and relaxed hand movements, you can stay afloat for extended periods without burning through your energy. Here’s how each piece works.
Why Technique Choice Matters So Much
Not all treading techniques are created equal. A study published in Frontiers in Physiology compared four common methods among skilled swimmers: the eggbeater kick, upright breaststroke kick, flutter kick, and vertical running. The eggbeater and breaststroke kick were significantly more efficient by every measure. Swimmers using the eggbeater averaged a heart rate of about 129 beats per minute, while flutter kicking pushed heart rates to nearly 147. Oxygen consumption told the same story: the eggbeater used roughly 23 ml/kg/min compared to 29 ml/kg/min for flutter kicking and running.
The reason comes down to physics. Flutter kicking and running both rely on pushing water downward to force your body upward. Water is too thin to provide much support that way, so you end up bobbing up and down with a lot of wasted vertical motion. The eggbeater and breaststroke kick instead sweep the legs in horizontal circles, creating a more constant upward force with far less bouncing.
How the Eggbeater Kick Works
The eggbeater gets its name because your legs make large alternating circles beneath you, like the beaters on a hand mixer. Sit in the water with your torso fairly upright and your knees bent at roughly 90 degrees, thighs spread apart. Each leg traces a circle in the opposite direction from the other, so one leg is always generating lift. Your right leg might circle clockwise while your left circles counterclockwise (or vice versa, whatever feels natural).
The key muscles driving this motion are the inner thigh muscles, which pull each leg through the power phase of the circle, and the muscles around the hip that control rotation and thigh position. Your quads support knee extension through each sweep. Unlike flutter kicking, which hammers the quadriceps and hip flexors in a rapid up-and-down pattern, the eggbeater distributes effort across a wider group of muscles in a slower, rotational pattern. This is one reason it’s less fatiguing.
Start slowly. The circles don’t need to be fast to keep you afloat. Focus on making them wide and smooth rather than quick. Speed up only when you need to rise higher out of the water, like water polo players do when reaching for a ball.
What Your Hands Should Do
Your hands scull gently near the surface, sweeping back and forth with your palms angled slightly downward. Think of spreading peanut butter on a table in front of you: smooth, flat, side-to-side movements. This provides a small but steady amount of additional lift and helps you balance.
A common mistake is pushing your hands straight down into the water, which wastes energy the same way vertical leg movements do. Another is moving the hands too frantically. If your arms are working hard, something is wrong with your kick. The hands are there for fine-tuning your position, not for keeping you afloat.
Body Position and Breathing
Keep your body as close to vertical as comfortable, with a very slight forward lean. Your head should sit naturally on your spine, as if you were standing on land. Tilting your head back or craning your chin up shifts your center of gravity and forces your legs to work harder to compensate.
Breathing plays a bigger role than most people realize. Your lungs act as a built-in buoyancy aid. When fully inflated, they significantly increase the amount of water your body displaces, making you float higher with less effort. Take full, deep breaths and avoid shallow panting. Each deep inhale gives you a small but meaningful lift, reducing the workload on your legs. Exhale at a normal pace rather than blowing all your air out at once.
Conserving Energy Over Long Periods
If you need to stay afloat for a long time, whether in open water or a survival situation, alternating between active treading and passive floating saves enormous amounts of energy. The drownproofing method developed at Georgia Tech works like this: take a deep breath, let your body go limp with about 98% of it submerged, and exhale roughly a third of your air. Allow yourself to hang in the water with just the back of your head above the surface. When you need another breath, exhale the rest, then use one small arm or leg movement to lift your mouth above the waterline. Inhale deeply and sink back to the resting position. Repeating this cycle, you can float essentially as long as you can stay awake.
This works because a relaxed human body with full lungs is very close to neutrally buoyant. You don’t need to fight to stay at the surface if you’re willing to let most of your body stay just below it. The energy cost drops to almost nothing between breaths.
For situations where you need your head continuously above water but want to last longer, alternate between the eggbeater kick and floating on your back. Even 30 seconds of back floating between treading intervals lets your leg muscles recover substantially.
Common Mistakes That Drain Your Energy
The single biggest mistake is using a technique that pushes water downward instead of sweeping it horizontally. If you feel yourself bobbing up and down with each kick, you’re wasting energy on vertical motion that does nothing for you. Switch to wider, more circular leg movements.
Tensing your whole body is the second biggest drain. Tight shoulders, a clenched jaw, rigid arms: all of it burns calories without producing any useful lift. Periodically check in with your body and consciously relax everything above the waterline. Your legs and core do the work. Everything else should be loose.
Kicking too fast is surprisingly counterproductive. Beginners often assume faster kicking equals more safety, but it just accelerates fatigue. Slow your kick down until you find the minimum speed that keeps your chin above water. That’s your sustainable pace. You can always speed up momentarily if a wave hits or you need to reposition, then settle back to your baseline.
Finally, trying to keep too much of your body out of the water is exhausting. You only need your mouth and nose above the surface to breathe. Letting your body sit lower, with the waterline near your chin or lower lip, can cut your energy expenditure dramatically compared to trying to keep your shoulders exposed.
Building Endurance for Treading
If the eggbeater kick feels awkward at first, that’s normal. It uses your inner thigh and hip muscles in a pattern they’re not accustomed to, and the coordination of moving each leg in opposite circles takes practice. Start in shallow water where you can stand if needed, and practice the leg motion while holding the pool wall or a kickboard for support.
Once the motion feels natural, practice treading in intervals: 30 seconds of eggbeater, 30 seconds of rest, gradually extending the work periods. Water polo players can sustain this kick for entire matches, but they’ve built sport-specific endurance over years. For most people, being able to tread comfortably for 5 to 10 minutes is a solid, practical goal. With consistent practice over a few weeks, the muscles adapt and what once felt like a workout starts to feel almost effortless.