Kicking and Streamline: The Fundamentals Behind Every Stroke

Before a child can swim a smooth freestyle or a strong backstroke, two quiet fundamentals do most of the work: the kick and the streamline. They're not glamorous, and kids almost always want to skip straight to the arm strokes. But a good kick and a long, tight streamline make every stroke easier, faster, and less tiring. Knowing how they work helps you see what your child's instructor is building, and how you can gently back it up at home under your close supervision.

What is streamline, and why does it matter?

Streamline is simply the longest, sleekest shape a swimmer can make to slice through the water. Picture an arrow or a rocket: arms extended straight overhead, hands stacked one on top of the other, biceps squeezing the ears, head tucked neutral, and the whole body long and tight from fingertips to toes. The legs are together and the toes pointed.

This shape matters because water creates a lot of resistance, far more than air. A child who swims in a short, bunched-up, head-up position is essentially dragging a parachute behind them. The same child in a clean streamline glides much further on the same effort. Every push off the wall and every glide between strokes is more efficient when the body is long and tight. Instructors often say that reducing drag is just as important as adding power, and streamline is the single best way to reduce drag.

A simple cue for streamline

Children respond well to vivid images. A few that work nicely:

• "Make yourself as tall as a rocket about to launch."
• "Squeeze your ears with your arms so you can't hear anything."
• "Stack your hands like one hand is giving the other a high five."

The most common mistakes are arms drifting apart, the head poking up out of line, and the body bending at the hips. Gentle reminders to "get long" and "hide your ears" usually do the trick. This is a shape worth practising calmly, because it pays off in every stroke your child will ever learn.

The kick: the engine that keeps the body up

The flutter kick used in freestyle and backstroke does two jobs: it provides some propulsion, but just as importantly it keeps the legs and hips up near the surface so the body stays flat and streamlined. A child with a weak or sinking kick ends up swimming uphill, which makes breathing and arm strokes much harder.

A good flutter kick is:

• Small and fast, not big and slow. The feet stay relatively close together and create a gentle, steady splash rather than huge thrashing kicks.
• Driven from the hips, with the legs long and only a slight bend at the knee. Kicking from bent knees alone is tiring and ineffective.
• Relaxed at the ankles, with floppy, pointed toes. Stiff, flexed feet act like brakes, while loose ankles let the feet whip through the water.

Instructors often have beginners practise kicking with a kickboard, or in streamline off the wall, precisely because it isolates this engine and lets children feel a strong, flat body position before adding the complexity of arms and breathing. Our guide on what the boards, noodles and fins are actually for explains where each piece of gear helps and where it gets in the way.

How kicking and streamline work together

The good stuff happens when the two combine. A streamlined push off the wall, then a steady flutter kick: that's the foundation of every stroke. In freestyle, the body holds a near-streamline line while the arms take turns pulling. In backstroke, the same long, flat position with a flutter kick carries the whole stroke. Even breaststroke and butterfly come back to a streamlined glide after each pull and kick. If your child is starting to look at the dolphin kick and butterfly timing, you will see how much of it rests on this one shape.

This is why coaches spend so much time here. A child who can hold streamline and kick steadily has the platform every stroke is built on. Without it, arm technique can only do so much.

Supporting it at home through play

Structured technique correction belongs with the instructor, but you can make these fundamentals fun and familiar through supervised play:

• Rocket push-offs: in shallow water you can stand in, let your child push gently off your hands or the wall into a streamline glide, seeing how far they can travel without kicking. This makes the long, tight shape feel rewarding.
• Pointy-toes kicking: while you support them or while they hold a kickboard, encourage a small, fast kick with floppy, pointed toes and a gentle splash.
• Tall as a rocket: practise the streamline shape standing up on the pool deck or in the shallows so the body remembers the position.

Keep it playful and short. Avoid turning it into repetitive drilling, and never let your child practise unsupervised. The goal is to build familiarity and enjoyment, not to formally coach.

Patience and the bigger picture

Building a strong kick and a reliable streamline takes time and varies from child to child. Some develop a powerful kick quickly; others need a season of steady practice. Progress is not always visible week to week, so trust the process and keep lessons consistent. If you ever feel your child is stuck, our guide on why kids plateau in swimming and how to help may be useful.

Because these fundamentals are so central, it is worth ensuring your child's program gives them proper attention rather than rushing to strokes. If you are choosing or reviewing a class, you can browse swim schools across Australia or explore all listed swim schools to find a program that builds strong foundations.

Frequently asked questions

Why does my child's instructor spend so much time on kicking and streamline?

Because these two fundamentals reduce drag and keep the body flat, which makes every stroke easier and more efficient. A child who can hold a tight streamline and kick steadily has a solid platform for freestyle, backstroke, and beyond. Skipping these basics tends to limit how well the actual strokes can develop.

What does a good flutter kick look like?

A good flutter kick is small, fast, and driven from the hips, with long legs, only a slight knee bend, and relaxed, pointed toes. It creates a steady splash rather than big, slow thrashing. Stiff ankles and kicking only from the knees are the most common things that hold children back.

How can I help my child improve their streamline at home?

You can make the long, tight "rocket" shape fun through supervised play, like gentle push-off glides in shallow water and practising the streamline pose on the deck. Use vivid cues such as squeezing the ears with the arms and stacking the hands. Keep it light and leave formal technique correction to the instructor.

Should kicking and streamline come before learning arm strokes?

In most programs the kick and streamline are built early because they underpin everything else, though instructors usually introduce arms alongside rather than waiting indefinitely. The exact sequence is the teacher's call based on your child's stage. The key point is that strong fundamentals make the strokes far easier to learn well.