The 70.3 São Paulo Half Marathon: Truly Flat, Three Laps

The Course: Flat With No Catches

21.1 km with just 22 meters of total elevation gain. Not "flat with a few overpasses": genuinely flat. Three laps inside a campus, which means frequent reference points, concentrated crowds, and the chance to know every meter of the course from lap one.

If you're a rhythm runner, it's a gift: no climbs to break your cadence, no descents to trash your quads. If you rely on the terrain to vary your effort, it's a trap: on a course like this the fatigue is monotonous and mental, and the fade hits without warning.

Three Laps: Use Them, Don't Suffer Them

The lap format is a tactical advantage if you plan for it:

• Lap 1 — control. Start 10-15 seconds per km slower than your goal pace. After 90 km of flat riding in aero, your legs lie: the first 3 km always feel easy.
• Lap 2 — build. Move up to goal pace. This is where you find out whether your bike pacing was honest.
• Lap 3 — push. If you've managed it well, this is where you pick off runners in bunches. On a flat course, the negative split isn't a stylish option: it's the correct strategy.

Ballpark times, not official: 2:30 for the relaxed finisher, 2:05 for the mid-pack goal, 1:45 if you want to go fast, 1:28 for top age-groupers.

The Weather: Two Scenarios, One Plan Isn't Enough

September 19 in São Paulo is early spring. Translation: highs around 27 °C, lows around 15 °C, but cold fronts can bring rain and a sharp temperature drop. You need to prepare for both scenarios:

• Hot scenario (27 °C): the run starts in the hottest hours of the day. Plan for ice and water over yourself at aid stations, a visor, and an even more conservative opening pace. Flat at 27 degrees wears you down more than it seems.
• Cold/rain scenario: at 15-18 °C with rain, the run becomes nearly ideal for a fast time, but the risk shifts to soaked shoes and blisters. Proven socks, no experiments.

You make the clothing call on race morning after checking the forecast, but both options need to be packed already.

The Test to Do Before Race Day

The flat-bike-plus-flat-run combo is specific and needs rehearsing. Between now and race day, do this workout at least twice: 60-80 km on the bike at race pace in the aero position, quick transition, then 40-60 minutes of running with the last 15 at goal pace. If you hold pace at the end of the brick, your watt ceiling on the bike is right. If you crack, lower it: on this course, run problems are almost always created on the bike.

Cutoffs and Margins

The final time limit is 8h30. If you're off the bike by the cumulative 5h00 cutoff, you have a generous 3h30 for the half marathon and T2: a brisk walk gets it done. On this course, the cutoff isn't the enemy. The enemy is the wall at km 14 because you pushed 20 watts too many on the highway.

What to Do Now

1. Plan your negative split by laps: write down the three target paces and memorize them. 2. Schedule two race-specific flat bricks in the final 6 weeks. 3. Prep the dual weather kit: hot option and rain option, decided in advance, not improvised in transition.