"I might just completely smash them with: `you thought five kilometres was easy well not after this'," Bridges laughed, mimicking her Biggest Loser coaching voice, in Launceston yesterday.

Bridges is in the state as the guest for today's breast cancer charity run and also to launch her new cook book Superfoods.

About 300 people attended the book launch and signing at the Queen Victoria Museum and Art Gallery yesterday to hear Bridges' talk about her book, answer question and meet the inspiring woman face to face.

Superfoods is Bridges's 10th book and includes easy to make meals including vegetarian, vegan and gluten free recipes.

Bridges said the ingredients initially came from her nutrition plan, were easy to access, cost effect, and the recipes were easy to make.

She said her favourite recipe was the Minted Brown Rice Salad.

"It's literally throw it together, it takes no time," she said.

Bridges said she was thrilled to be the guest at today's charity run, which starts at City Park at 10am.

"I'm totally bummed that I can't [run], but I'll be at the finish line giving everyone high fives as they come along," Bridges said.

She will spend 15 minutes warming participants up before the race with cardio and stretching exercise.

"It's more just about having some fun and adding a little bit of colour and excitement to the race," she said.