Pianoperformer: I do find that most people interested in Personal Development have a variety of interests that might seem unrelated to others.
I like your tagline "Stretch the limits." It certainly applies to all the areas you write about. You may find that you try different taglines. When it feels right, you might change it to "Transcend the limits." I think stretching for a while is a great plan.
You can also try different names for your blog. As it now stands, the name of your blog is perfect -- it is, after all, Brandon's Blog.
In addition to your tagline, you might find that a visual image ties together the themes. Or several visual images.
A blog is a powerful way to clarify parts of your life. As you write, you discover. In fact for me, my first reason for blogging is for myself -- I love to write. I love the creativity and the discovery.
Enjoy the process!
Jeanie
Empowering Personal Development