Grammy award-winning country music singer Carrie Underwood is dipping her toe in the fitness industry, with the launch of a fitness app which she says will ultimately form part of a "holistic wellness platform".

The new fit52 will be available on Apple's iOS platform and has been created in partnership with Creative Labs and entertainment and sports agency Creative Artists Agency (CAA).

fit52 will offer a wide variety of workout routines last around 30 minutes. The workout programme has been created by Underwood in collaboration with her personal trainer, Eve Overland.

Each workout is different and is based on the hand of virtual playing cards that the user gets dealt with. Each card demonstrates an exercise and number of reps, randomly revealed to provide a full-body workout.

While the app is free to download, users will have to pay either a weekly (US$1) or annual (US$52) subscriptions fee to access the workouts.

"The fit52 app incorporates what I've been doing myself for years, and we've made it easy and totally accessible for anyone that wants help to work in working out," Underwood said.

"We worked really hard to create a high-quality, user-friendly app that is designed for busy people and their busy lives. fit52 meets you wherever you are on your health journey, and I'm so proud of it."

Pauline Moller, CEO at Creative Labs, added: "When Carrie came to us with this concept, we saw a great opportunity to create a platform that is fun, community-focused and relieves the burden of over-complicated programs that align with people's schedules and motivations. We are incredibly excited to work with Carrie to develop this program further."

Underwood is one of the biggest stars of country music. She has sold more than 70 million records worldwide and has won seven Grammy awards.