A blog is a website or an area of a website where entries are made in a journal-style format and are displayed in reverse chronological order. Blogs often provide commentary or news on a particular subject. 

In this case, resistance exercise, aerobic/cadio fitness, diet and nutrition. 

Quite often, Web Logs (Blogs) function as a more personal online diary. 

A typical blog combines text, images, and links to other blogs, web pages, and various media related to its topic.  Additionally, the ability for readers to leave comments in an interactive format is an important component of a well constructed web presence.

The aforementioned is why a blog is crucial for a client-based service. Your clients will not only have a resource to access vital information, but they can comment, question and interact with others who share their own concerns, insights, and individual experiences.