I’m trying to catalogue all the “big” names on Tumblr in the health/fitness/info sector. The ones listed here I think have 10k+ followers. If you have any to add, let me knowJust a side note, this is totally going to change/be updated so try not to reblog (weird thing to ask). Just like it so you can save it if you need to.
Personal blogs (focused on their routines/opinions etc)
http://beccaliving.tumblr.com/
http://undressedskeleton.tumblr.com/
http://chelseaalysse.tumblr.com/
http://barbellsandbeakers.tumblr.com/
http://fitvillians.tumblr.com/
http://www.matchstickmolly.com/
http://fromflabbytofit.tumblr.com/
http://justbreathe831.tumblr.com/
http://runningtothefinish.tumblr.com/
http://nopityfitness.tumblr.com/
http://the-fitspirational-blonde.tumblr.com/
http://joy-of-health.tumblr.com/
http://powerrprincess.tumblr.com/
http://findingthinagain.tumblr.com/
Information/Health/General (mostly reblogs)
http://losing-every-extra-pound.tumblr.com/
http://muffintop-less.tumblr.com/
http://fitforinfinity.tumblr.com/
http://healthy-petals.tumblr.com
http://fitness-barbie.tumblr.com/
http://fatt-cheerleaders-suck.tumblr.com/
http://motiveweight.tumblr.com/
http://letsseethoseabs.tumblr.com/
Fitspo & graphics (fitspo images and creates own graphics)
http://realgirlfitspothinspo.tumblr.com/
http://gymandmotivation.tumblr.com/
http://fitspoholic.tumblr.com/