The title says everything. I'm trying to aim somewhere near this -> http://fitness.ee/ Registration, lots of different panels, search panel, forum & website itself are combined ( for gaining user points etc.) I hope you understood the whole idea.
You must provide the image and all of the facilities and what is it for? and you must explain the benefit of the fitness equipment
I would suggest you use Wordpress, particularly if you are new to web design and website building. It is free, easy to use and customize. If you have experience with website building, then try Joomla or other web design application like XSitePro.
Do you have any huge sites to show me which use Joomla / Wordpress ? I can't make up my mind which one should I use
I'd say WP - it's the easiest to work with if you are just starting out. That way you can focus on marketing efforts.
Definitely wordpress. I think it's by far the best platform. It also has a great plug in support. Joomla is also very good, but i prefer WP.
Id use wordpress since wp is pretty friendly with SEO and there are many useful plugins you can use to make your fitness site more professional