The silence after the push-off
Push off the wall. Hard.
In the first second, the noise disappears. Conversations by the pool, the lapping of the lane lines, the breathing of other swimmers. Everything fades away. All that remains is the glide. That seemingly effortless motion where your body streaks beneath the surface, propelled by the momentum of the push-off.
This is the streamline.
It lasts two seconds, sometimes three. It’s the fastest movement in your swim. Faster than any arm stroke. Faster than your most powerful kicks. The reason is purely physical: underwater, you only face one force, drag. On the surface, you face two: drag and wave resistance. Underwater, you have a mechanical advantage that you lose as soon as your head breaks the surface.
Each length contains at least two streamlines. One at the start, one at the turn. In a 200-meter race in a 25-meter pool, that's eight streamlines. Eight opportunities to gain or lose tenths of a second without a single arm stroke. In competition, these tenths often decide the race.
The streamline is not a dead time between two phases of swimming. It is a technical skill in its own right. One that demands the most rigor, and tolerates the least error.
« The streamline is not dead time between two phases of swimming. It is a technical skill in its own right. »
Anatomy of the position
Your goal underwater is simple to state, difficult to execute: present the smallest possible frontal surface while maintaining perfect alignment.
The arms. Extended in front of you, one on top of the other, biceps pressed against your ears. Hands are stacked, palms facing down. The space between your arms and your head must be zero. The slightest gap creates a resistance front that slows you down.
The head. In exact alignment with the spine. Gaze towards the bottom of the pool, slightly forward. Raising your eyes, even a few degrees, is enough to break alignment and cause your hips to rise. The neck remains a natural extension of the back, relaxed.
The torso. Engaged. Abs engaged, not locked. The difference matters. The pelvis remains neutral: neither arched towards the bottom nor raised towards the surface. Your body forms a single continuous line, from your fingertips to your toes.
The legs. Tight, active but not rigid. Ankles are extended, feet pointed. They complete the hydrodynamic shape. Relaxed feet dragging in the wake measurably increase drag.
Common mistakes. The most common: the hips sagging. Fatigue, lack of core engagement, or simply habit cause a break at hip level. You don't always feel it. But it slows you down with each streamline.
The other pitfall: opening your arms too early, before the momentum of the push-off has decelerated. You initiate your first arm stroke when you are still faster in a pure glide. You brake to restart.
« Present the smallest possible frontal surface while maintaining perfect alignment. "
Undulations: the invisible whip
The speed of the push-off decreases quickly. After one meter, sometimes two, propulsion must be restarted. This is the role of undulations, the dolphin kick performed in a streamline position.
The movement originates from the sternum. Not the knees. Not the hips. From the upper torso, like a wave propagating downwards. The shoulders initiate a slight oscillation. The torso transmits. The hips amplify. The legs whip. This is the final acceleration, the one that propels. The knees flex barely, just enough for the feet to clap with amplitude.
The classic pitfall: bending the knees like for a freestyle kick. The undulation is not a kick. It is a continuous, fluid wave, without interruption. A whip, not a piston.
The frequency depends on the objective. In sprinting, undulations are fast, powerful, short, two or three strokes at full intensity. In middle-distance, they slow down: three to four ample, controlled undulations that restart without exhausting. In long-distance, economy is key: one to two are enough, just enough to maintain speed before surfacing.
The timing of initiation is critical. Starting too early, before glide speed has decelerated, is like braking. Your body undulates when it would glide faster in a static position. Waiting too long allows speed to collapse. The right moment is somewhere in between: when you feel the momentum fading, but before it dies out.
When to surface
The rule is mechanical: as long as your underwater speed exceeds your surface swimming speed, stay underwater.
World Aquatics rules require surfacing within 15 meters. But the technical question is not "how long can I stay?", it's "at what point do I lose the advantage?"
For most trained swimmers, the tipping point is between 5 and 10 meters. Elites push it to 12-15 meters thanks to impeccable positioning and incredibly efficient undulations.
Underwater, there's no reliable stopwatch, no clear visual reference. You must learn to read your sensations. The increasing resistance against your face. The propulsion losing efficiency. The rising need for oxygen. These signals converge to the same instant, the one when you must surface, initiate the transition, and start the first arm stroke without breaking the acquired speed.
« The undulation is not a kick. It is a continuous, fluid wave, without interruption. A whip, not a piston. »
Building your streamline: 4 levels
Level 1: The line
Objective: Feel and memorize the hydrodynamic position.
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Push off the wall, arms in streamline position, no undulation
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Glide as far as possible while maintaining strict alignment
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Mentally note the distance reached
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Repeat 5 times, try to gain 10 to 20 cm with each pass
What you are working on: Static core engagement, hand placement, body line awareness. This is the foundation. Without it, nothing else holds.
Level 2: Controlled undulation
Objective: Add propulsion without losing alignment.
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Same push-off, same position
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Add 3 slow, ample undulations
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Focus on initiating from the sternum; the hips should not break
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Repeat 8 times
What you are working on: Torso-leg coordination, wave fluidity, amplitude control. If the movement is jerky, slow down even more.
Level 3: The transition
Objective: Surface without losing speed.
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Push-off + 3 to 5 undulations
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Transition to your first swimming stroke
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The arm exits the water in exact continuity with the streamline, no brutal tearing, a fluid ascent
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Repeat 10 times
What you are working on: The timing of surfacing. Speed retention. The streamline-swim transition, which is often the weak link.
Level 4: Streamlining under fatigue
Objective: Maintain rigor when the body gives out.
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After an intensive set (e.g., 8x50m at high intensity), immediately follow with 6 complete streamlines with transition
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Your body is tired, your abs relax, your position degrades
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Maintain strict alignment despite everything
What you are working on: Discipline in competition. In a 200-meter race, the last streamlines are the ones that degrade the most, and the ones where time is won or lost.
Strategy by distance
Sprint (50m). Maximum push-off. Two to three powerful undulations. Quick surfacing, around 7-8 meters. The objective: reach maximum surface speed as quickly as possible, without wasting initial propulsion.
Middle-distance (100-200m). Powerful but measured push-off. Four to five sustained undulations. Surface around 10-12 meters. Turns become strategic, often where gaps widen, because fatigue encourages sloppy streamlines.
Long-distance (400m and more). Controlled push-off, energy saving. Two to three undulations are sufficient. Surface as early as 6-8 meters to limit oxygen debt. Consistency trumps distance: it's better to have consistent streamlines over thirty-two lengths than one spectacular streamline followed by fifteen mediocre ones.
The invisible movement
The streamline is not visible from the stands. It plays out beneath the surface, in silence. Perhaps this is why it is so often neglected in training, and yet so crucial in a race.
Swimmers who perform well share a common trait: their streamlines are identical from the first to the last length. Same position. Same amplitude. Same rigor. The discipline of the invisible movement separates those who swim well from those who perform.
This is also when your equipment matters most, or rather, when it should matter least. Underwater, in a streamline position, the slightest wrinkle, the slightest excess thickness, the slightest added resistance from the fabric translates into drag. At 0.4 mm thick, woven warp and weft for a smooth and uniform surface, DROP fabric was selected for this precise moment: when the suit must cease to exist. Assembled seamlessly, by high-frequency welding and bonding, with laser-cut raw edges. Nothing catches. Nothing creates turbulence.
You shouldn't feel your suit. You should feel the water.
Discover our suits.
It is in this underwater silence, in this fraction of a second where you effortlessly glide, that the streamline finds its meaning. The position. The undulation. The timing. And that unique sensation: pure glide, without friction, without obstruction. The art of shaping the water.
« You shouldn't feel your suit. You should feel the water. »
SHAPE THE WATER.
