Open Water Swimming Tactics: Sighting, Drafting, and Race Execution
Every season the same pattern plays out. An athlete spends the winter reducing their 100-metre pool time, attends masters squads, and obsesses over catch mechanics in a lane-roped environment. Their aerobic capacity is genuinely high. In the pool, they are fast.
Then comes the first open water race. The same athlete exits the water three minutes behind their predicted time, breathless and frustrated. They check the GPS and see 1,700 metres on a 1,500-metre course. They blame the sun glare, the washing machine at the first buoy, the conditions. The actual explanation is simpler. They failed to translate physiological capacity into open water speed.
Research consistently shows that while heart rate and oxygen consumption remain broadly constant between pool and open water, the kinematic variables deteriorate significantly once the black line is removed. Stroke rate, stroke length, and stroke index all fall apart when an athlete is forced to navigate, sight, and manage the chaos of a mass start. These are skill problems. More pool volume does not fix them.
01 | Sighting: Physics and Technique
Sighting is the single most disruptive element of front crawl in open water. In the pool, the black line provides constant passive directional feedback. In open water, you must actively lift your head to find where you are going, and every lift carries a biomechanical cost.
The body in the water functions like a see-saw, with the fulcrum roughly at the lungs. When the head — the heaviest weight — lifts, the hips and legs drop. When the hips drop, frontal surface area increases and the angle of attack changes, raising pressure drag significantly. The momentum generated by the previous stroke is partially diverted from forward propulsion to vertical lift. Many athletes instinctively kick harder to compensate, spiking heart rate and burning glycogen that the run will need.
The technique that mitigates this is what I call crocodile eyes. The objective is to minimise vertical head displacement so the bow wave the head creates at speed is preserved rather than interrupted. Time the sighting action to occur immediately before turning to breathe — as the lead arm extends, lift just high enough for the goggles to clear the water surface with the nose and mouth remaining submerged. From that low position, turn into the breath using the air pocket created by the bow wave. The stroke rate and kick continue through the entire action; pausing the lead arm to sight is what collapses the hips. With practice, a landmark can be acquired in a fraction of a second at this height. What is lost in the ability to survey the horizon is more than recovered in the drag that is not created.
Sighting frequency should be governed by course complexity and conditions rather than a fixed number. In flat, calm water with a clear landmark, every eight to ten strokes is enough. In crosswind chop, low sun, or confusion about line, sighting every four to six strokes is the correct trade. The time cost of slightly elevated drag at high sighting frequency is always less than the time cost of noticing a 50-metre drift too late to correct cheaply.
02 | Navigation and Line Choice
Navigation errors are among the most significant hidden time losses in triathlon. An athlete swimming five to ten percent more than the course distance is not unusual, and the cause is almost always stroke asymmetry combined with insufficient sighting.
Most athletes pull harder on their dominant side or carry a slight lateral kick asymmetry. In the pool, the black line corrects this automatically. In open water, without that visual anchor, small directional biases manifest as arc swimming. Bilateral breathing is often recommended as the fix, but for adult-onset swimmers who are genuinely uncomfortable on their non-dominant side, forcing bilateral breathing degrades confidence and rhythm without reliably correcting the drift. The more practical intervention is accepting the tendency to arc and correcting it frequently through better navigation.
The first requirement is selecting the right landmark. A race buoy is a poor sighting target — it is small, bobs in the water, and disappears in any significant chop. The reliable target is a large fixed object behind or beyond the buoy: a building, a tree, a distinctive shoreline feature. These remain visible with crocodile eyes and do not move with the water.
The geometric straight line between buoys is often not the fastest path. In a strong cross-current, aiming directly at the buoy results in a banana curve — the current pushes the athlete wide and they must swim upstream to recover the line. Aiming upstream of the target and ferrying across the current produces a straight ground track. When sun glare sits directly along the course line, a slightly wider arc that allows sighting off a shoreline or a group of swimmers ahead is faster than swimming blind on the theoretical optimal route.
03 | Drafting
Drafting is the most potent tactical tool available in the swim. Research on front crawl drafting has demonstrated up to a 21 percent reduction in passive drag when swimming directly behind another athlete at zero to fifty centimetres distance. This translates to lower oxygen uptake, lower heart rate, and lower blood lactate. For a triathlete, the downstream benefit is equally significant — drafting has been shown to improve subsequent cycling efficiency by close to five percent. The energy saved is carried onto the bike.
Two drafting positions exist and serve different purposes. Swimming directly behind the feet captures the maximum hydrodynamic benefit but demands constant speed adjustment — if the leader slows, there is contact; if they kick erratically, the drafter takes it in the face. It requires sustained attentiveness and works best in steady conditions on long straight sections.
Positioning at the leader's hip, with the drafter's head level at their lead hip, offers a smaller benefit of six to seven percent but provides superior visibility and greater positional stability. The drafter is riding the bow wave rather than sitting in the wake, and is not boxed in when the pack compresses at a turn.
The practical decision rule is this: stay on the feet in a steady pack on a long straight; move to the hip in choppy water or when approaching a buoy. The hip position allows claiming space before the compression of the turn rather than being carried into it by the pack.
Abandoning the draft is the correct decision when the leader is navigating poorly, changing direction erratically, or setting a pace that requires a Mad effort to hold. Following a zig-zagging swimmer negates the drag benefit — swimming a straight line past them costs less than following their inefficient path. The draft is worth keeping when it provides free speed at Moderate effort that would otherwise require Medium effort to generate solo. It is worth abandoning when it is costing more than it provides.
04 | Buoy Turns
Buoy turns are where form under fatigue most visibly collapses for age-group athletes. The sudden direction change and the compression of the field create conditions that frequently produce a complete loss of momentum.
Two approaches exist. The tight line hugs the buoy and minimises distance but carries the highest contact risk. Getting compressed into the bottleneck, stopping to tread water, and restarting from a dead stop in water is enormously energy-expensive — both the cardiovascular cost of the restart itself and the heart rate spike that follows require recovery time that cuts directly into the early bike. The wide arc adds five to ten metres of distance but preserves momentum, maintains rhythm, and avoids the pile-up entirely. For most age-group athletes, especially those who lack the explosive power to restart cleanly from stopped, the wide arc is the faster total strategy.
Approaching the turn, increase sighting frequency to identify the gap in the traffic and sight past the buoy rather than at it. Maintain a smooth arc rather than a hard corner. Never stop to look. A few strokes of high-cadence shallow pulling keep speed through the corner without the drag penalty of a full-effort stroke. Immediately after clearing the turn, ten to fifteen strokes at hard effort create space from the pack before settling back into the race rhythm. This brief burst costs relatively little glycogen and buys position that would otherwise be lost to the compression of the exit.
05 | The Start
The start of a triathlon swim is physiologically predictable and practically manageable once the mechanism is understood. The combination of adrenaline, cold water shock response, and the sprint intensity of the first 200 metres creates conditions that produce hyperventilation and panic in athletes who are not prepared for them.
Cold water immersion triggers an involuntary gasp reflex and a rapid heart rate increase. Attempting maximum effort before breathing has stabilised risks falling apart within the first two minutes. In severe cases, the high pulmonary pressure of intense swimming in cold conditions can contribute to swimming-induced pulmonary oedema, where fluid leaks into the lungs. The correct response to the start is controlled aggression: strong effort to find feet and establish position, with complete attention on the exhale. Forcibly blowing air out underwater prevents carbon dioxide buildup, which is the primary driver of the air hunger and panic sensation rather than any actual oxygen deficit.
Start positioning depends on swimming confidence and race strategy. A strong swimmer at a race with a tight first buoy benefits from front and centre positioning to claim drafting position early and avoid the pinch point. A mid-pack swimmer or one prone to start anxiety is better served starting wide or delaying the entry by a few seconds — the extra distance from a wide start is negligible compared to the time lost to a panic attack in the pack.
For athletes whose breathing falls apart in the opening minutes, I use a cognitive anchor: count thirty strokes. Focus only on the count. The objective is to break the distance into a small, manageable segment and shift attention from the perceived threat of the open water to the specific task of the stroke. After thirty strokes, reset and count again. Most athletes find their breathing has stabilised by the second or third count.
06 | Pool Sets
Open water skills do not require dedicated separate sessions that displace physiological training. They can be built into normal swim sessions with minimal structural change.
The sighting integration set develops the automation of the crocodile eyes action within a threshold or endurance context. During main sets of 100 or 200-metre repeats, sight every six strokes for the final 50 metres of each repetition, using a water bottle or bright object at the end of the lane as the landmark. The emphasis is on maintaining rhythm — no lifting of the whole head, no pausing of the lead arm, eyes up and head down in one continuous action. The progression is to increase the pace of the repetitions from Medium toward Mad while strictly maintaining the technique. Sighting at easy effort requires little skill. The specific adaptation needed is maintaining it at threshold.
The stress start simulator trains the ability to recover from a high-intensity surge while continuing forward at race pace. Four to six rounds of 50 metres at Mad effort followed immediately by 150 metres at Moderate effort, with 20 seconds rest between rounds. The transition between the sprint and the steady swim must be seamless — no stopping at the wall. This is the specific skill the race start demands: lowering heart rate and recovering breathing while still moving.
The drafting lane requires a group of three or four. Swimmers share a single lane for 400 metres continuously, changing the lead position every 50 or 100 metres, with drafters staying within 30 centimetres of the leader's feet. The focus is on closing and holding the gap rather than leaving space that nullifies the benefit. The progression has the lead swimmer adding random ten-metre surges to test the drafters' ability to react and close immediately rather than allowing a gap to form.
07 | Three Athletes
Three athlete types appear repeatedly in open water racing, each with a specific problem and a specific fix.
The first is the fit mid-pack swimmer who swims 1,750 metres on a 1,500-metre course. Their pool pace is solid. The problem is navigation — they sight infrequently, rely on nearby athletes rather than fixed landmarks, and their natural stroke asymmetry drifts them off line before they notice. The intervention is sighting mechanics in every pool session for the first four weeks, training crocodile eyes until it is automatic, and a single race morning cue: sight the fixed landmark behind the buoy, check every six strokes.
The second is the strong pool swimmer who swims sub-25 minutes for 1,500 metres in controlled conditions but loses rhythm the moment another athlete makes contact. They end up swimming alone, abandoning all drafting benefit, and spending more energy than their pool fitness requires. The intervention is the drafting lane set repeated until close contact and swimming in bubbles becomes normal rather than threatening. The race morning cue is to take the wide arc at buoys to preserve rhythm rather than fighting for the tight line, and to own the hip position in a pack rather than flinching away from it.
The third is the athlete who can physically complete the swim distance but arrives at the start line with genuine anxiety about the mass start. The chaos is the problem, not the fitness. Four weeks of stress start sets builds familiarity with the cardiovascular state the start creates and the specific ability to settle from it while still moving. The race morning cue is the Count to 30: count strokes, focus on the exhale, reset at thirty, and trust that the breathing will normalise.
The energy saved in the swim is energy available on the bike and run. An athlete who exits the water controlled rather than spent is starting the bike from a different physiological position than one who fought through the swim — and that difference shows up long before the run. If you want to work with a coach who integrates open water skill development into the preparation from the start rather than treating it as a separate problem, Sense Endurance Coaching is where to begin.
If you are preparing from a plan, the swim sessions are built around the paddle and pull buoy work that develops the upper body strength the open water demands, with the technical progressions embedded in the sets rather than treated as extras. You can find the full range on the training plans page. The swim is where the race is either protected or quietly compromised. It deserves the same deliberate preparation as the bike and run.
