These blogs are some of my favorite.
http://chelseaalysse.tumblr.com/
http://lilieszenblog.tumblr.com/
http://believe-toachieve.tumblr.com/
http://healthandthings.tumblr.com/
http://therealityofskinny.tumblr.com/
http://a-fitspirational-blonde.tumblr.com/
http://size2health.tumblr.com/
http://findingthinagain.tumblr.com/
http://healthyequalshappy.tumblr.com/
http://sweatsparkles.tumblr.com/
http://thatsexyhealthygirl.tumblr.com/
http://cakeistheenemy.tumblr.com/
That was a lot lol and there are more. These are great people so check all of them out.