Even pacing in big city marathons is rarely realistic for sub-3 runners due to congestion, GPS drift and human behaviour. But by running to effort, aiming for a slight negative split, and harnessing the energy of the crowds and occasion, you can still achieve the evenness that really matters.

Even pacing in big city marathons is rarely realistic for sub-3 runners due to congestion, GPS drift and human behaviour. But by running to effort, aiming for a slight negative split, and harnessing the energy of the crowds and occasion, you can still achieve the evenness that really matters.