The Half Marathon on Atalaia Beach: Flat on Paper, Brutal in the Heat

The course

21.1 km along Atalaia Beach, Aracaju's signature beach. Elevation gain is minimal: 60 m according to the official page, 82 m according to another course data source. Either way: flat. The course runs close to the crowd, who can follow athletes from up close along the orla. The number of laps isn't published in the sources we checked: verify it in the athlete guide before race day, because it changes your mental game and how you count aid stations.

The real opponent: 30°C and tropical humidity

Let's be blunt. At past editions, the heat was the main character. Media coverage of the 2025 edition describes "crushing" temperatures around 30°C, with some athletes needing assistance at the finish line for exhaustion. Multiple race reports confirm it: extreme heat, mental management decisive. And the run starts when the sun is already high, after more than three hours of racing for most age-groupers.

Translation: your triathlon half-marathon pace in cool conditions doesn't apply here. Dial it back and accept that before the start, not at km 8 when it's too late.

Pacing: conservative for the first 5 km

The classic trap on flat courses: fresh legs off the aero bars, crowd close by, pace creeping up. On this course the bill comes due between km 12 and km 16, when accumulated heat load stacks on top of fatigue.

Concrete plan:

• Km 1-5: 10-20 seconds/km slower than your target. It should feel easy.
• Km 5-15: goal pace, but only if your heart rate stays within the expected range.
• Km 15-21: this is where you find out if you managed it well. If yes, you can close with a negative split. If not, you limit the damage.

The reference splits in the race sheet (2:30 for the relaxed finisher, 1:45 for the fast goal) are estimates, not official data: use them as a rough guide, then adjust for the conditions on the day.

Cooling: at every aid station, no exceptions

Active cooling isn't an extra, it's part of the race plan:

• Ice: in your tri suit, under your cap, in your hands. As soon as it melts, reload at the next aid station.
• Water on your body: head, back of the neck, thighs. Mentally separate the water you drink from the water you pour over yourself.
• Sponges: if available, on the back of your neck and under your top.
• White cap or visor: several athletes from past editions highlight the importance of sun protection along the orla, where shade is scarce.

Do it from the first aid station, not when you start struggling. By the time you feel you're struggling, overheating is already underway and it's far harder to recover from than to prevent.

Hydration and electrolytes

The tropical climate increases fluid and sodium losses. Decide before the race how much to drink and how much sodium to take per hour, and test it in training during the hot hours. On the run, your stomach tolerates less than on the bike: small, frequent amounts work better than big gulps. If you arrive in T2 already in deficit, no run strategy will save you: the Aracaju half marathon is prepared in the 90 km that come before it.

What to do now

1. Train during the hot hours in the weeks before the race, or plan to arrive early to acclimatize: it takes days, not hours. 2. Rehearse your cooling routine: run long sessions with ice and water on your body to learn what your stomach and skin can tolerate (watch out for chafing from a wet tri suit). 3. Set a ceiling pace for the first 5 km and write it down. On race day, the energy of the crowd along the orla will work against your discipline.

On this course, the difference between a great half marathon and a death march isn't fitness: it's whoever respected the heat from the first kilometer.