Why pool pace breaks down in open water — the 3-stroke drill that fixes sighting

The pool-to-open-water gap — what the timing data shows

If you swim a clean 1:30/100 m in a 25 m pool and then jump into Georgian Bay for a 1500 m time trial, do not be surprised when your watch reads 1:55-2:10/100 m. The gap is real, it is repeatable, and it shows up even in well-trained masters swimmers who train year-round. Tipton and colleagues, in their broad physiological review of open-water swimming, document that pool-trained athletes commonly add roughly 15-30 percent to their per-100 m pace when they move outdoors (Tipton et al., Extreme Physiology & Medicine, 2014). Some of that gap is hydrodynamic — no walls, no push-offs, no lane lines to dampen turbulence — but most of it is skill-shaped.

The walls alone matter more than people realise. A push-off and underwater dolphin sequence in a 25 m pool is faster than free-swimming speed, and you get that gift every 12-15 seconds. Toussaint's drag and propulsion work (Toussaint, Sports Medicine, 1992) shows that active drag during free swimming dominates the energetic cost of pool pace, so when you remove the walls you remove a meaningful chunk of the rest interval and the speed bonus simultaneously. A 1500 m pool swim contains roughly 59 wall pushes. A 1500 m lake swim contains zero.

The second slice of the gap is sighting. Every time you lift your head to look forward, your hips drop, your kick has to compensate, and your body line breaks. Maglischo's stroke-mechanics work (Swimming Fastest, 2003) puts the cost of a single full head-lift sight at roughly 0.3-0.5 seconds of forward progress, plus a residual recovery stroke before body position is fully restored. Sight ten times in a 1500 m and you have spent 3-5 seconds plus the drag of disrupted body line — call it 8-12 seconds total. Sight thirty times and the cost compounds toward 25-40 seconds.

The third slice is stroke-rate drift. In the pool you have a black line and a pace clock. In a lake you have neither, and stroke rate tends to fall under chop, cold, and visual disorientation. Hellard and colleagues, working with elite distance swimmers (Hellard et al., Journal of Sports Sciences, 2008), found that stroke rate and stroke length co-vary in trained athletes — but only when the swimmer has an internalised tempo. Strip the pace clock and most age-group masters lose 4-8 strokes per minute within the first 400 m of an open-water race.

Add walls, sighting, and rate-drift together and the 30-45 second-per-100 gap is no longer mysterious. It is also, importantly, not a fitness problem. You cannot train your way out of it with more intervals. You have to train the skills that the pool never asked of you.

Sighting frequency — too little vs too much

The instinct of a nervous open-water swimmer is to sight a lot. Every fourth or fifth stroke, head up, scan, breathe, swim. By the 800 m mark the neck is tight, the hips have been sitting low for fifteen minutes, and pace has collapsed. The opposite error — sighting only when something feels wrong — produces big arcs off the buoy line and 30-50 m of bonus swimming per kilometre.

Mujika's work on tapering and race-specific skills (Mujika, Endurance Training, 2012) makes a useful distinction: in any endurance sport, the cost of a skill must be amortised against the navigational benefit it buys. Sighting too often is paying skill-tax without buying enough direction. Sighting too rarely is saving the tax and paying a much bigger detour cost.

The practical sweet spot for most masters swimmers in a calm-to-moderate lake is one sight every 6-10 strokes — roughly every 8-12 seconds at a 60-70 stroke-per-minute cadence. In chop or low sun, tighten to every 4-6 strokes. In a clean point-to-point with a clear large buoy and no crosswind, you can stretch to every 12-16 strokes once you have proven on two consecutive sights that you are on line.

The other half of the equation is how you sight, not just how often. A crocodile-eye sight — eyes just above the waterline, mouth still submerged, head lifted only a few centimetres — costs a fraction of a full head-lift. Maglischo describes this as a "split sight": the forward lift is decoupled from the breath, so you can sight forward on stroke N and rotate to breathe to the side on stroke N+1, instead of trying to do both in one motion. The combined head-up-and-rotate move is the single most common stroke-killer in age-group open-water swimming.

Breath asymmetry as a hidden cost

Most pool swimmers breathe to one side. In a controlled lane this is harmless. In open water, unilateral breathing means you cannot see half the field, you cannot adjust if the sun or chop favours one side, and your stroke becomes asymmetric under fatigue — the non-breathing arm tends to over-reach and cross the midline, which Toussaint's drag work (Toussaint & Beek, Sports Medicine, 1992) flags as a measurable increase in active drag.

Bilateral breathing — every third stroke, alternating sides — solves three problems at once. It evens out the stroke, it lets you sight to either side depending on sun and chop, and it gives you a built-in tempo: three strokes, breathe; three strokes, breathe. That tempo is the seed of the drill in the next section.

The objection to bilateral breathing is that it reduces oxygen intake at race effort. This is true at threshold and above, but the gap is smaller than swimmers think. Studies of breathing pattern at sub-threshold paces show no significant performance cost for bilateral patterns in trained swimmers (Cardelli et al., reviewed in Journal of Sports Sciences, 2000), and the open-water benefits — symmetry, two-sided field awareness, tempo — dominate at the steady aerobic paces that make up 95 percent of a 1500-3000 m open-water swim.

The 3-stroke drill: sight every 3rd stroke, both sides

Here is the drill. Do it once a week, in the pool, for four weeks before any open-water event.

Set: 8 x 100 m freestyle, 20 seconds rest. Pattern within each 100:

• Strokes 1-2-3, breathe right
• Stroke 4, crocodile-eye sight forward (eyes only, no full head-lift)
• Strokes 5-6-7, breathe left
• Stroke 8, sight forward
• Repeat

That is sight-every-fourth-stroke with a bilateral breathing scaffold. Once it feels automatic — usually by the second session — stretch to sight every 6th stroke (1-2-3 breathe right, 4-5-6 breathe left, then sight on stroke 7), and finally every 8th stroke for calm conditions.

The drill teaches three things simultaneously. First, it decouples sighting from breathing, so the head-lift is short and the breath is a clean side-rotation. Second, it forces bilateral breathing, which evens the stroke. Third, it builds a metronomic tempo — the strokes between sights become a counted rhythm, which is the closest thing to a pace clock you will get in open water.

A note on the pool side: stagger the sights to actually look at the wall or a marker on deck. The brain needs the visual loop to fire — if you "fake" the sight by lifting the head with closed eyes, the drill becomes a neck workout, not a skill session.

Stroke-rate metronome work — pool prep for open water

The second skill the pool does not train naturally is tempo stability under sensory load. Hellard's distance-swimmer data (Hellard et al., 2008) shows that elite swimmers maintain stroke rate within ±2 strokes per minute across a 1500 m race; age-group masters drift by 6-10. A small tempo trainer — a waterproof metronome that clips to the goggle strap and beeps at a set rate — closes the gap quickly.

Pick your target rate first. Most masters swimmers race well at 58-70 strokes per minute for distances 800 m and up. Count your strokes in a 100 m time trial, double it (strokes per minute equals strokes per 100 m divided by the seconds the 100 took, times 60), and set the metronome 2-3 beats below your time-trial rate. That is your aerobic open-water cruise tempo.

Then swim to the beep. Three sessions per week of metronome work, 1500-2500 m at cruise tempo, embeds the rhythm. Mujika's tapering and skill-retention work (Mujika, 2012) suggests that motor patterns like cadence stabilise within 3-4 weeks of repeated exposure, which lines up with the time most masters swimmers need before a target open-water race.

The reward shows up on race day. When the chop kicks up and the lead pack is gone, you have a beat in your head and your stroke does not collapse. That alone is worth 10-20 seconds per 100 m in a 1500 m race.

Drafting (the legal pack-swim advantage)

Drafting is the cheapest free time in open-water swimming. Chatard and Wilson's work on swim drafting (Chatard & Wilson, Medicine & Science in Sports & Exercise, 2003) is the canonical study: at race pace, drafting directly behind a similarly-paced swimmer reduces oxygen cost by roughly 11-21 percent depending on position, and drafting in the "hip pocket" (level with the lead swimmer's hip, one body-width to the side) gives a smaller but still meaningful 6-10 percent saving.

The practical implication for a masters swimmer: find feet at the start, hang on, and let the lead swimmer sight. You will swim faster for less effort, and you do not have to navigate. The penalty is that you have to push hard for the first 100-200 m to lock onto the pack, and you have to trust that the lead swimmer is on line — which is why bilateral sighting matters even when drafting, as a sanity check every minute or so.

Drafting is legal in every open-water event I know of, from local lake swims to Olympic 10 km marathon swimming. It is not cheating; it is part of the sport. The only etiquette rule is no tapping toes — touch a foot occasionally during a pack-swim and it is accepted, but a sustained pull on the lead swimmer's ankles is poor form.

Chop + cold-water Georgian Bay considerations

Georgian Bay in May and June runs 12-16 °C. By August it rises to 18-22 °C in the shallow bays. Below about 15 °C the cold-shock response is a real factor for the first 30-90 seconds of immersion: inspiratory gasp, elevated heart rate, peripheral vasoconstriction, and a transient reduction in breath-hold capacity. Tipton's cold-water shock work (Tipton, Quarterly Journal of Experimental Physiology, 1989; Datta & Tipton, Journal of Applied Physiology, 2006) is the foundational evidence and remains the basis of every open-water safety brief.

Three practical points follow. First, never start a cold-water swim by diving or jumping. Wade in to the waist, splash water on the face and neck, and let the gasp reflex settle for 30-60 seconds before putting your face down. Second, the first 200 m of any cold-water swim is a controlled, easy-tempo segment — not a race start. Stroke rate should be lower, breath should be deliberate, and sighting should be more frequent because cold disorients direction sense. Third, a neoprene cap (and, where rules allow, a neoprene wetsuit) blunts the cold-shock response substantially by reducing the rate of skin temperature drop.

Chop is the second Georgian Bay variable. A 15-20 km/h southwest wind builds 30-60 cm waves on the open bay within a couple of hours, and your sighting strategy has to adapt. Sight on the crest of a wave, not in the trough. Tighten sighting frequency to every 4-6 strokes. Breathe to the side away from the wind so your mouth opens into the lee of your head, not into a spray of water. These are small adjustments, but they are the difference between a clean swim and a 90-second cough-and-recover stop at the first buoy.

Practical takeaways

• Pool pace and open-water pace differ by 15-30 percent for most masters swimmers; the gap is skill, not fitness.
• Sight every 6-10 strokes in calm water, every 4-6 in chop, using a crocodile-eye lift decoupled from the breath.
• Breathe bilaterally — every third stroke, alternating sides — to even the stroke and see both sides of the field.
• Train stroke-rate stability with a tempo trainer at 58-70 strokes per minute, three sessions a week for 3-4 weeks.
• In cold water, wade in, give the gasp reflex 30-60 seconds to settle, and start the first 200 m at controlled tempo.

Extended takeaways

The biggest mental shift in moving from pool to open water is accepting that the skills you have built — wall pushes, lane-line drafting, pace-clock pacing — do not transfer. Open water is a different sport that shares a stroke. The athletes who close the 30-45 second gap fastest are the ones who treat sighting, bilateral breathing, and tempo stability as primary training goals for 3-4 weeks before the event, not bolt-on accessories the week before.

The second shift is about pack swimming. Drafting is the largest single free gain in the sport — 6-21 percent oxygen cost reduction depending on position, per Chatard and Wilson — and yet most masters swimmers start cautiously and watch the lead pack disappear. The first 150-200 m of an open-water race is the only time the field is compact enough to lock onto feet. After that, you are swimming alone. A short, sharp opening tempo, then settle into draft-and-sight, costs less energy over 1500 m than starting steady and hunting feet from behind.

The third shift is about cold and chop as skills, not hazards. Georgian Bay rewards swimmers who have practised in cold water, who own a neoprene cap, who have rehearsed the gasp-reflex settle on a calm shoreline before the race morning. Tipton's body of work makes a clean case that cold-water tolerance is partly acquired through repeated submaximal exposure, not just bravery. Three or four 15-minute swims in 14-16 °C water before the season opens are worth more than any single hard interval set.

Frequently asked questions

How much slower should I expect to be in open water versus the pool?

For a masters swimmer who has done little open-water-specific training, 30-45 seconds per 100 m slower is typical at distances of 800-1500 m, per Tipton et al. (2014). After 3-4 weeks of sighting and bilateral-breathing work, most athletes close the gap to 15-25 seconds per 100 m, and a small subset who train drafting and tempo close it further.

Do I need a wetsuit to swim in Georgian Bay?

Wetsuits are strongly recommended below about 18 °C for any swim longer than 20 minutes, and most organised events make them mandatory below about 16 °C. A wetsuit blunts the cold-shock response (Datta & Tipton, 2006) and provides additional buoyancy, which makes sighting easier. In summer (above 20 °C), a wetsuit is optional and many swimmers prefer skins.

How do I count strokes per minute without a tempo trainer?

Count the number of strokes (one arm only) you take in 30 seconds and double it. For a 50 m pool, count strokes per length and divide by the time you took. Aim for 58-70 strokes per minute for distance work; sprinters run higher (72-85). A waterproof tempo trainer costs less than a pair of goggles and removes the guesswork.

Is bilateral breathing really faster than breathing every two strokes?

At sub-threshold paces (the vast majority of open-water race effort), bilateral breathing shows no significant performance cost in trained swimmers and produces a measurably more symmetric stroke. At threshold and above — say, the final 200 m of a 1500 m race — switching to two-stroke breathing on the dominant side is a reasonable tactical move, but the rest of the swim benefits from the bilateral pattern.

What is the single most useful piece of open-water swim kit?

For most masters swimmers it is a safety swim buoy, on the grounds that visibility to boat traffic and a leg-up rest option are non-negotiable safety basics. Tinted goggles run a close second for any dawn, dusk, or sunny open-water session — the difference in sighting clarity is substantial. A neoprene cap is essential below 16 °C and useful below 18 °C. Owning all three is cheap insurance and a measurable performance benefit.

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