I have this health and fitness blog http://www.healthsurgeon.com/ I have been using this theme for some time, any suggestion for a good theme
I think this theme would be great for your blog with a few modifications: https://wordpress.org/themes/flat-bootstrap/preview/ It has the added benefit of being done with bootstrap so it's totally responsive and mobile friendly
Marla & MesoColumn is nice (free theme) Marla theme, screenshot homepage: https://wordpress.org/themes/mesocolumn/ MesoColumn theme, screenshot homepage: https://wordpress.org/themes/mesocolumn/
Lots of free ones to choose from! http://wordpressthemesgallery.net/tag/health-fitness/ or Google search, you'll find so many!
You can choose your theme from http://themeforest.net/tags/health blog and http://www.infoparrot.com/category/wordpress/themes/. You will find a huge collection of themes for your blog.
Well, your blog is related to health and fitness so you must pick the theme related to health. It attracts the readers who genuinely want to read health related blogs. There are lots of online sites are available based on health and fitness. You can choose a suitable theme from there.
You can search over the web, there are lots of themes available for blogs. I also have designed a template for my blog using template generator, you may also try to design it by yourself.