The Top 6 Tumblrs for Fitness. Fun blogs.but serious about fitness. Jun 22, 2013 | 11:09 pm. By. Jess Scanlon. Flickr/Romain Toornier. Animated GIFs aren't the only things that move on Tumblr. It's also one of the top social media sites where people go for fitness advice, healthy recipes and inspiration. We clicked through. Poppy explained in a blog post that the media covering her story actually misinterpreted. After the…