BMW Berlin Marathon

{
  "guide": [
    "Berlin rewards even pacing. Do NOT bank time — the second half is where world records are run, not the first.",
    "Wide roads mean you can run perfect tangents. Lock onto the blue line painted on the course.",
    "Weather makes Berlin. Cool, dry, low wind — the only reason it's the WR course. Train in similar conditions.",
    "Sub-3 pacers go out at exactly 4:15/km. Find one and lock in."
  ],
  "profile": "The fastest marathon course in the world. Net flat, wide boulevards, very few sharp turns. This is where 8 of the last 9 men's world records have been set.",
  "terrain": "flat",
  "keyFeatures": [
    "km 0 — Strasse des 17 Juni start, wide enough for a clean opening pace.",
    "km 25–32 — Long, flat boulevards through Charlottenburg and Schöneberg. The make-or-break section.",
    "km 38 — Potsdamer Platz. Crowd density hits its peak here.",
    "km 42 — Brandenburg Gate at km 41.7, then 500 m straight to the finish on Strasse des 17 Juni."
  ],
  "elevationGain": 60,
  "elevationLoss": 60
}