Hydration Strategies.
Hydration doesn't fail randomly — it fails in specific situations. Each protocol below shows what athletes commonly notice, why it happens, and the specific adjustments that help.
Nine protocols for the situations that break standard hydration plans.
Five condition-based protocols (heat, long training, taper, travel, flavour fatigue) and four race-specific protocols (Ironman, marathon, ultra, HYROX). Each one isolates a single failure mode and tells you what to adjust — without forcing you to overhaul the rest of your plan.
When the situation changes, the protocol changes.
Five conditions account for most hydration failures in training and racing. Each section explains what athletes notice, why it happens, and what to adjust.
Hot & Humid Racing
In hot or humid conditions, sweat rate and sodium loss increase — but fluid tolerance often doesn't. Athletes are told to "drink more," yet the gut frequently becomes the limiting factor.
- Sloshing or bloating mid-race
- Nausea despite drinking on schedule
- Cramping or early fatigue
- Falling behind hydration plans
- Uncertainty about what to adjust
When sodium is fixed to fluid, increasing sodium requires more drinking. Fluid becomes the limiter, not sodium. Athletes under-replace sodium or overload the gut trying to keep up.
Separate sodium from fluid. Adjust each independently.
Separating sodium from fluid allows sodium intake to better match sweat losses while fluid stays within gut tolerance. Fewer forced decisions mid-race.
- Increase capsule rate by 1 capsule/hr above your baseline for every 5°C above 25°C
- Drink to thirst — don't force fluid to hit sodium targets
- Start sodium intake earlier than you think you need to
- If cramping occurs, take an additional capsule immediately with 200ml water
- Use your calculator profile as the baseline — adjust up in the field
Long Training Days
On long or back-to-back training days, hydration accumulates across sessions rather than happening all at once. Sweat losses add up, appetite can drop, and fatigue blunts normal thirst cues.
- Feeling behind despite drinking regularly
- Late-day cramping
- Inconsistent recovery between sessions
- Difficulty rehydrating when appetite is low
Fixed drink mixes can under-deliver sodium across long days, force unnecessary fluid late in the day, and increase GI load when appetite is already low.
Recalculate per session. Build sodium across the day.
Separating sodium from fluid allows sodium to build gradually across the day while fluid follows thirst — producing more consistent hydration across multi-session blocks.
- Treat each session independently — recalculate sodium needs per session
- Between sessions: 1 capsule with your recovery meal or snack
- Don't force large fluid volumes when appetite is low — sodium first, fluid follows
- On back-to-back days, start session 2 with a capsule before you feel you need it
- Monitor urine colour — pale yellow is the target, not clear
Pre-Race & Taper
In the days leading into a race, training volume drops but hydration anxiety often rises. Sweat losses are low, sessions are shorter, and athletes focus on "doing everything right" — often drinking more than they need.
- Frequent urination throughout the day
- Clear urine despite feeling hydrated
- Feeling heavy or flat on race morning
- Low "pop" in warm-up
During taper, hydration shifts from sweat replacement to storage. When fluid intake increases without enough sodium support, excess water is excreted rather than retained — leaving athletes over-flushed and under-supported.
Drink to thirst. Use sodium to support what you do drink.
Sodium supports fluid retention during taper. The goal is to drink to thirst, not to a schedule — and use sodium to support what you do drink.
- 2 days out: 1 capsule with each main meal
- Night before: 1 capsule with dinner and 1 with your final fluid before bed
- Race morning: 1 capsule 60–90 min before start with 400–500ml water
- Don't chase clear urine — pale yellow means you're retaining fluid appropriately
- Reduce forced fluid intake — sodium will do more than extra water
Travel & Heat Adaptation
Travel introduces hydration challenges without training load. Flights, dry cabin air, time zones, and sudden climate changes all affect hydration — even when exercise volume is low.
- Persistent thirst that fluid doesn't resolve
- Frequent urination despite adequate intake
- Poor sleep quality on arrival
- Feeling flat or "off" in first training sessions
Most hydration products assume exercise and sweat. During travel and heat adaptation, hydration is about maintaining balance — not replacing losses. Drinking more fluid alone often doesn't improve how hydrated athletes feel.
Maintain balance — don't force losses you aren't having.
Sodium support without forcing fluid — drinking to thirst while keeping sodium stable helps maintain balance through travel and in the early days of heat adaptation.
- During flights: 1 capsule every 3–4 hours with 300–400ml water
- On arrival: 1 capsule with your first meal in the new location
- Heat adaptation phase (days 1–5): 1 extra capsule per training session above your normal protocol
- Don't force large fluid volumes — drink when thirsty, sodium will support retention
- Expect higher sweat rate in first 5–7 days — recalibrate your protocol after adaptation
Flavour Fatigue
Some athletes struggle with sweet or flavoured hydration products — especially during long sessions or in the heat. But sodium losses still occur regardless of what's palatable.
- Growing aversion to electrolyte drinks after 2–3 hours
- Avoiding intake because nothing tastes right
- GI discomfort when forcing sweet products
- Unintentionally under-hydrating in the back half of long events
When sodium, sugar, and flavour are bundled together, increasing sodium requires increasing sweetness. Athletes who hit their flavour ceiling stop drinking — and sodium intake collapses with it.
Plain water plus capsules. Sodium on the clock, not the tongue.
Separating sodium from fluid means sodium intake no longer depends on palatability. Plain water stays palatable across any duration — sodium doses on schedule regardless.
- Replace flavoured electrolyte drinks with plain water + Lytework capsules
- Keep your carbohydrate strategy separate — gels or chews rather than carb drinks
- Dose sodium on a time-based schedule, not based on how you feel or what tastes good
- If you use carb drinks, choose low-sodium versions and cover sodium needs with capsules
- In long events, set a timer for capsule intervals so intake doesn't rely on desire
Four race formats. Four different problems.
Race-specific protocols built around the dosing window each distance allows. Ironman is paced sodium; HYROX is front-loaded sodium; ultras are alarm-based sodium. The variable is when, not whether.
Ironman & 70.3
Long-course triathlon stacks three disciplines across 4–17 hours. Sodium losses accumulate across the swim, build heavily on the bike, and become the most common reason athletes fall apart on the run. Most race-day hydration is built around bike bottles — which works until it doesn't.
- Strong bike split, then a run that "falls apart" after 10–15km
- Cramping on the run despite drinking on the bike
- GI shutdown in the second half — can't tolerate gels or drink
- Headaches, nausea, or disorientation late in long days
- Feeling fine at T2, wrecked by km 25
On the bike, fluid and carb intake is relatively easy — athletes hit their plan. On the run, fluid tolerance drops, aid stations dictate intake, and the cumulative sodium deficit from the previous 5–10 hours becomes visible. Fixed-dose drinks can't scale sodium up without scaling fluid up too.
Treat each discipline as its own dosing window.
Build sodium ahead of the run so the deficit isn't already there at T2.
- Race morning: 1 capsule 60–90 min before start with 400–500ml water
- Bike (full IM): Use your calculator profile as baseline — add 1 capsule/hr above 25°C ambient
- Bike (70.3): Front-load slightly — sodium debt builds fast at higher intensity
- T2 sodium top-up: 1 capsule with 200ml water before starting the run
- Run: 1 capsule every 30–40 min — match fluid to aid stations, don't force
- If cramping starts, take 1 extra capsule immediately — don't wait for the next interval
Marathon
The marathon is short enough that under-fuelling can be hidden, but long enough that under-sodium-ing is brutal. Most marathoners focus on carbs and pace. Sodium gets one or two electrolyte drink stops along the course — usually not enough for warm conditions or high sweat rates.
- Strong first 25–30km, then a wall that isn't just glycogen
- Calf or hamstring cramping in the final 10km
- Feeling slow and heavy despite good preparation
- Worse outcomes in warm conditions than expected
- Inconsistent performance across similar races
Course-provided drinks deliver a fixed sodium dose that doesn't scale to the individual. A high-sweat-rate athlete in warm conditions may need 3–4x what's on offer at the aid stations — and there's no practical way to drink that much.
Carry your sodium. Use aid stations for fluid.
Course-provided drinks can't scale to your individual losses. Bring sodium with you.
- Race morning: 1 capsule 60 min before start with 300–400ml water
- During race: 1 capsule every 30 min, taken with water at aid stations
- Hot conditions (above 20°C at start): Increase to 1 capsule every 20–25 min
- Stick to plain water + gels at aid stations — sodium handled separately
- If you typically cramp in the final 10km, start one capsule earlier than scheduled
- Practice the protocol in your long runs — race day is not the time to test it
Ultra Running
Ultras stretch hydration across 6, 12, 24 hours or more. Conditions change — heat by day, cold by night. Pace varies wildly. Real food enters the picture. Sodium becomes the single most important variable to manage because errors compound over time, not minutes.
- Hour 8+ — appetite drops, stomach turns, intake collapses
- Hyponatremia symptoms: nausea, confusion, swollen hands
- Walking sections you should be running
- DNFs in races you trained for
- Different problems at different points of the race
Drinking too much plain water dilutes sodium. Drinking too much sports drink fails the taste test by hour 6. Real food helps but doesn't deliver enough sodium for high-sweat athletes. The product that worked at hour 2 doesn't work at hour 14.
Sodium on schedule, not on feel.
Capsules give you a baseline that's independent of what you can eat or drink at any given hour.
- Pre-race: 1 capsule the night before with dinner, 1 with breakfast pre-race
- During race: Set a watch alarm — 1 capsule every 45 min, regardless of how you feel
- Hot daytime sections: Add 1 capsule above your alarm baseline every hour
- Crew points: Confirm capsule count, don't rely on memory in fatigue
- If you can't eat solid food, capsules still deliver — don't skip them when appetite drops
- Trail vs road: same protocol — sweat rate is the variable, not surface
HYROX
HYROX is short enough (60–90 min for most athletes) that hydration during the race is minimal — but high intensity, indoor venues, and bunched starts mean sweat rates are often higher than athletes realise. Pre-race sodium becomes the lever, not in-race.
- Feeling drained at the wall ball or compound movements
- Cramping in the final running segments
- Worse performance at indoor events than outdoor
- Heart rate drift higher than training
- Heavy, salt-marked kit post-race
Indoor venues run hot. Warm-ups are aggressive. The race itself is too short to drink meaningfully — by the time you'd benefit from in-race sodium, you're done. The window to dose well is the 90 minutes before you start.
Front-load before the start. Race intake is minimal.
Race intake is minimal — you're working with what's already in the system.
- 90 min pre-race: 1 capsule with 400–500ml water
- 30 min pre-race: 1 capsule with 200ml water during warm-up
- During race: Sip water at stations if available — sodium already in
- Post-race: 1 capsule with rehydration drink to start recovery
- For doubles or back-to-back events: capsule between rounds with 300ml water
- Test in race-pace training sessions — same conditions, same protocol
Find your sodium target.Build your protocol.
These protocols tell you what to adjust. The Lytework calculator tells you where to start — your exact sodium, fluid, and capsule targets based on your physiology and conditions.
These protocols are decision frameworks based on exercise physiology principles. They explain what to adjust and why — not a universal prescription. Individual needs vary by sweat rate, environment, intensity, and tolerance. Use in conjunction with your personalised Lytework calculator output.