Around 15,000 runners are expected to pound the pavements for the 35th Bath Half Marathon. It is a fast and flat route, said to be suitable for all abilities and one where PBs can be achieved.
The two-lap 13.1 mile course starts and finishes in Great Pulteney Street and straddles both sides of the River Avon.
Sharon Davies will start the race at 11:00 am.
Today is the last day for people to sign up for one of the region's biggest half marathons.
The race, which takes place in the middle of October, attracts more than 3,000 runners. It was first run back in 1985.
A husband and wife from Somerset have just published a book which charts their two-person odyssey around Britain. Jen and Sim Benson are so-called 'Wild Runners'.
That means they don't go jogging on roads or pavements but on beaches, fells and tracks.
And their guidebook shows where you can take up the sport. For their research they ran hundreds of miles - even while Jen was many months pregnant.
Robert Murphy reports:-