It's pretty hard to know what to write, here, since you haven't specified what the blogs will be about, but... hmm, I guess I'll just say what I can provide, as a writer - and on which subjects.
What I could say, about my writing, is that I'm going to give you the absolute best stuff I can. And I do know a lot of stuff, I could write about. I wouldn't hold back, on anything, since I know the better I do, the more I will get back (as corny as that might sound, it's the truth).
What you get, with me, is a very articulate writing. You get a very in-the-moment writing, as well. The writing is rhythmic. You get a person who is PASSIONATE about writing, and about constantly improving his writing (things which naturally translates into a good influence on the writer; since the emotional state is "caught" in the text, meaning I will make the reader feel more positive).
I could write any self improvement stuff off of my head, since I'm very well versed in psychology; based on the first hand experience I have of being in a depression, and getting out of it (when finding the one thing that has ever worked, for that purpose, after ten years).
I could write about writing, since I have been writing a lot for the last 6 months; and come up with a lot of useful mentalities, and strategies, to employ; in order to become a good/better writer.
When it comes to fitness, I could write about my own workout method; which anyone could use without ever visiting a gym. I could maybe give one new exercise per week, or something.
About health.. I could give very simple guidelines, for someone to use, in order to not have to ever go on a diet. I could write about meditation (for mental health). I could write about why you should/how you use your breath in ways that really improve your ability to focus/your physical health.
I could write about dating, since I'm "good" at that. I would provide a very fresh perspective, where it's all about becoming more who you are (which, in this case, isn't equal to being a sissy with women; but living up to who you REALLY are, as a man; which includes being both dominant and sweet). I could write about what is really going on, out there (as opposed to the superficial non-reality-based stuff, you read everywhere).
I could write about guitar playing, since I have my own guitar-method; providing snippets of it, every week, for the reader.