The double-Olympic gold medalist learned a lot about his race.
Priscah Jeptoo and Tsegaye Kebede are the newly crowned champions.
Boston One Fund has already raised $10 million in donations.
She had been primed to run well in New York last year.
No athletes have dropped out due to security concerns.
British runner comments about running half of the London Marathon this weekend.
He was the surprise winner in the British capital last summer.
Race Results Weekly also provides broader updates on next weekend's event.
Officials are revisiting security arrangements for Sunday's race.
Where exactly the top British runner will pull off the marathon course is still hush-hush.