The run on the Promenade: flat on paper, brutal in practice

Four laps on the Promenade

Race reports describe four laps of roughly 10 km on the Promenade des Anglais, with the stretch toward the airport along the beach. A 2023 finisher points out there's no elevation gain, yet her run was slower than expected.

The heat, always

Athletes starting the run in the afternoon describe full sun: one participant says she struggled to breathe after 500 meters, got a calf cramp, and alternated running and walking, dousing herself at every aid station; when temperatures dropped in the late afternoon, she recovered. A 2024 finisher writes that on the run "the wheels came off" and he shuffled to the finish, two hours past his target.

The half at the 2026 70.3 Worlds is also described under "leaden heat," in a "crazy" atmosphere but with empty legs after the bike. One athlete cramped in her hands, quads, and glutes, with pickle juice, salt, and gels doing nothing.

What works

• Ice and sponges at every aid station, even when you don't feel you need them.
• First lap slower than planned: it's the most common mistake in race reports.
• The crowds along the Promenade are a resource: those who hit a rough patch say it helps them get going again.
• 60 g/h of carbs with sodium, tested on afternoon long runs.

The finish line

A 2023 finisher described the marathon as "magical": a controlled bike, fresh legs on the Promenade. Push too hard on the climbs and you pay for it here.

AI summary from athletes' public race reports; no statements are attributed to real people.