The returning champion has made a bold prediction.
She says she walks almost every day and logs dozens of miles a week.
Top-ranked 5,000m runner Eliud Kipchoge set to attack 13 minute barrier.
2009 champion Aheza Kiros the women's pre-race favorite.
She still owns the world record for 10K on the roads.
She now stands a good chance of setting a marathon record in April
It was his second attempt to run 365 marathons in 365 days.
The race's enormous prize purse has attracted a talented field.
The 29-year-old British veteran has already been breaking records in other distances.
The nonagenarian marathoner was logging up to 50 miles a week of training.