Personal trainers can definitely offer value. They can help you focus on trouble areas. They can help you get over a plateau. And they can provide the motivation you need to push through and achieve your resolutions and goals. Blog about the reasons to get a personal trainer. (And perhaps mention a few reasons to not get a personal trainer.)
For other blogs, personal trainers are also known as coaches. These days there are coaches for just about anything. Have you hired one? Or explored the possibility of hiring one? How can they be helpful and would you do it again?