Your Home, Training and Celebrities pages are the only ones with real current content, and they would all easily be transferred into define pages or ez-pages. Your template is nice and simple, and would also be easy to translate into Zen Cart's template system.

Start by turning off side columns in admin > Configuration > Layout Settings, then copy/paste your homepage HTML into admin > Tools > Define Pages Editor > define_main_page.php. Read the tutorials for basic customization issues like logo, tagline, etc.