Why the Marathon Has Two Women’s World Records 🏃‍♀️⏱️

If you look at the official distance running record books, you will see two distinct finishing times recognized for the women’s marathon world record:

• Mixed-Gender World Record: 2:09:56 (Ruth Chepngetich, Chicago 2024)

• Women’s-Only World Record: 2:15:41 (Tigst Assefa, London 2026)

Nearly six minutes separate these two performances. Yet, World Athletics recognizes both as official, valid world records.

Why the distinction? It comes down to a fundamental operational choice made at the starting line: whether male pacemakers are permitted on the course or if the women compete completely separate from the male field.

How "Women's-Only" Races Work

To qualify for an official women-only record under World Athletics Rule 31, races like the London Marathon send the elite women out 35 to 40 minutes ahead of all other fields. This calculated gap ensures that male runners do not catch or pass the leading women before they reach the finish line. Additionally, every pacemaker assigned to the lead group must be female.

The Physics of Mixed-Gender Racing

In open-field marathons like Chicago or Berlin, elite women run on the course alongside men. Tucking behind a formation of taller, broader male pacers creates a low-pressure aerodynamic slipstream.

Biomechanical research shows that drafting reduces frontal drag by 50% to 70%, yielding a 2% to 4% reduction in energy cost over 26.2 miles. Beyond the physical slipstream, dedicated male pacers absorb the cognitive burden of split monitoring and pacing adjustments, allowing female athletes to lock into a continuous rhythm.

Two Records, Two Standards of Excellence

The dual-record framework was formally instituted in 2013 after widespread backlash over an earlier proposal to invalidate mixed-field marks. Today, the system protects two distinct athletic achievements:

1. Mixed-Gender Records: Show what female physiology can achieve under optimal aerodynamic and pacing assistance.

2. Women's-Only Records: Preserve the tactical essence of unassisted, head-to-head racing against the elements.

Both marks showcase elite human performance on the world stage.

Want to explore the full breakdown of drafting biomechanics and historical race rules? Check out the complete article live now on [MarathonJournal.com].

Happy running,

Letty Lundquist

Editor-in-Chief, Marathon Journal