The former Sarah Palin's Alaska star shared with People that her currently untitled book will present "unique and motivating" exercise and diet plan.
"Our family is writing a book on fitness and self-discipline focusing on where we get our energy and balance as we still eat our beloved homemade comfort foods," Palin explained in a statement to the magazine.
It has not yet been announced if Palin's book has been sold to a publisher.
Palin has previously authored Going Rogue: An American Life and America By Heart: Reflections on Family, Faith and Flag, both of which ranked on The New York Times Best Seller list.
She rocketed to international prominence as John McCain's running mate in an unsuccessful bid for the US presidency in 2008.
Palin currently serves as an analyst for the Fox News Channel.