Reddit Fitness (www.reddit.com)
Redditors obsessed with fitness share tips, advice, and the latest research here.
Strength Sensei (www.strengthsensei.com)
Strength Sensei focuses on in-depth analyses of complicated topics, such as insulin sensitivity and hormone optimisation.
A blog collecting a variety of kinds of stories, tips, and programs for your yoga practice, as well as news about yoga.
Neghar Fonooni (www.negharfonooni.com)
Offers more than fitness and nutrition advice, she also provides a constant stream of thoughtful and inspiring motivational posts.
T-Nation offers a variety of articles on nutrition, training, supplements, and all sorts of bodybuilding information.
Bodybuilding.com (www.bodybuilding.com)
Bodybuilding.com holds a special place in internet history; not only does it offer loads of information on training, nutrition, etc, but it also hosts one of the longest-lived and most vibrant discussion forums on the web.
Summer Tomato (www.summertomato.com)
Summer Tomato was founded by a neuroscience Ph.D. and focuses on healthy eating (without the guilt and suffering that goes along with dieting) as a means to fitness.
12 Minute Athlete (www.12minuteathlete.com)
Offers a constantly-shifting set of routines that can be done in 12 minutes with little or no exercise equipment.
Breaking Muscle (breakingmuscle.com)
Breaking Muscle compiles advice, insight, and training programs from several different trainers and fitness experts.
Bayesian Bodybuilding (bayesianbodybuilding.com)
It was founded by a statistician and bodybuilding coach, and provides in depth articles for advanced trainees about lifting and nutrition.
Nerd Fitness (www.nerdfitness.com)
Nerd Fitness offers fitness tips for those of us who find themselves on the "nerd" end of the "nerd-jock" spectrum.